Navigating the Evolution of the Side Mount BCD
If you are looking for a highly versatile side mount bcd built to handle everything from recreational cave passages to deep technical mixed-gas diving, the Custom Katana 2 Sidemount is arguably one of the most streamlined, customizable harness systems on the market today. Designed specifically for active divers who demand rapid harness adjustment without sacrificing horizontal trim, this system delivers exceptional stability, modular weight distribution, and durable build quality. Whether you are climbing into tight wreck restrictions or looking to ease back strain by carrying cylinders on your sides, we believe this rig represents a stellar investment that will scale with your diving journey.
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Sidemount diving is no longer just a tool for extreme cave explorers. Over the last decade, it has entered the mainstream of recreational and technical diving. The freedom of movement, redundancy of carrying two completely independent gas sources, and ease of gear transportation have made the side mount bcd the setup of choice for many seasoned divers. But not all sidemount rigs are built equal. Many older designs were simply modified back-mount systems that left divers feeling bulky, unstable, and clumsy in the water.
The Custom Katana 2 Sidemount changes that dynamic entirely. Developed in collaboration with some of the world's leading cave and technical diving instructors, it addresses the common pain points of traditional harness systems: slow adjustment times, poor bladder shape, and limited weight-capacity options. When you are squeezing through a tight restriction or hanging on a deco stop for an hour, you don't want to think about your gear. You want it to behave like a natural extension of your body. Let's break down exactly why this system performs the way it does in real underwater environments.
The Anatomy of Streamlining
In traditional back-mount diving, your cylinder sits directly on your spine. This design naturally wants to roll you over if your weight distribution is slightly off. With a dedicated sidemount system, your cylinders are tucked neatly under your armpits, running parallel to your torso. This significantly reduces your vertical profile, allowing you to slip through tight horizontal openings that would be completely impassable in a standard twinset.
However, to make this work, your buoyancy compensator must distribute lift in a very specific way. If the bladder provides too much lift near your shoulders, your feet will sink. If it provides too much lift near your hips, your head will be forced downward. The Custom Katana 2 distributes its 40 pounds of lift in a low-profile, triangular pattern. This places the bulk of the lift right where your center of gravity naturally sits, making it almost effortless to maintain a flat, horizontal trim position.
---Technical Specifications and Design Philosophy
To truly understand how this system works, we must look at the technical blueprints. The design team prioritized robust materials, intuitive hose routing, and modular configuration. Below is a detailed breakdown of the technical specifications that form the backbone of the Custom Katana 2.
| Feature / Specification | Details & Material Grade |
|---|---|
| Bladder Material | High-tenacity 1000-Denier Cordura with polyurethane lamination |
| Inner Bladder | Thick, puncture-resistant 15-mil urethane inner bladder |
| Buoyancy Lift Capacity | 40 lbs (18.1 kg) of balanced hydrostatic lift |
| Harness System | Patented Q-Fit adjustable design with quick-release shoulder points |
| Weight Capacity | Up to 20 lbs (9 kg) via modular spine-aligned weight pockets |
| Dump Valve Configuration | Dual pull-dump valves (one lower-left, one upper-center) |
| Bungee Setup | Configurable loop bungees with customizable length and tension |
| Country of Design | United States (engineered in Florida) |
Looking at these specs, the use of 1000-denier Cordura is particularly noteworthy. Many travel-oriented sidemount systems use lighter 420-denier nylon to save weight in luggage. While that is fine for occasional warm-water reef diving, it simply does not hold up to the abrasive realities of cave passages, barnacle-encrusted shipwrecks, or cold-water quarry diving. The heavy-duty outer shell of the Katana 2 serves as an armor plate, protecting the inner bladder from punctures and tears when you find yourself rubbing against a jagged ceiling.
For those interested in the deep engineering principles of diving systems, reading the official manual reveals the meticulous attention paid to gas routing and safety configurations. The system is designed to allow both left- and right-handed inflator hose routing, depending on whether you run your drysuit or wing inflation off your left or right cylinder.
---The Q-Fit Harness System: Why It's a Game Changer in Ergonomics
If you have ever set up a traditional sidemount harness, you know it can be a nightmare. Traditional continuous-weave harnesses require you to feed a single, stiff piece of 2-inch webbing through a series of metal tri-glides, adjust the length, try it on, take it off, adjust it again, and repeat the process for several hours. If you switch from a 3mm wetsuit to a thick drysuit with heavy undergarments, you have to do the entire process all over again.
The patented Q-Fit harness system elegantly solves this problem. It separates the shoulder adjustment from the waist adjustment while maintaining a continuous webbing feel under water. This allows you to tighten or loosen the harness in seconds, much like a standard jacket-style BCD, without compromising the security or fit of the harness plate on your spine.
How the Q-Fit System Works on a Practical Level
- Adjustable Shoulder Straps: By utilizing custom-engineered metal friction plates, the shoulder webbing can be pulled tight with a simple downward motion. This secures the harness snug against your collarbones.
- Quick-Release Chest Buckles: These low-profile heavy-duty buckles allow you to easily slip out of the rig after a long dive, which is a massive benefit when standing on a pitching boat deck or climbing up a steep, muddy riverbank.
- Sliding D-Rings: The waist strap features fully adjustable sliding D-rings. As your cylinders lose weight during the dive (especially when using aluminum 80s), you can easily slide these D-rings forward with your thumb to pull the tank bottoms back in line with your hips. This prevents the tanks from swinging upward as they become positively buoyant.
By resolving the complexity of harness fitting, the Q-Fit makes sidemount diving highly accessible to divers who might have been intimidated by the tedious setup process of older systems. It is also a dream configuration for dive instructors who need to adjust a single rig to fit various students during a training course.
---Bladder Profile, Lift Capacity, and Trim Mechanics
Buoyancy control is the foundation of safe diving. The bladder of the Custom Katana 2 is specifically molded to hug the diver’s back, keeping the air bubble low and wide. When air shifts inside a standard BCD, it can cause you to wobble from side to side. The Katana 2's bladder is engineered to limit side-to-side gas shifting, ensuring that your horizontal plane remains rock-steady even when you are actively swimming or turning.
With 40 pounds of lift, this side mount bcd has more than enough capacity to handle heavy steel cylinders, multiple stage tanks, and substantial exposure suits. In cold-water diving where thick drysuits and heavy steel tanks (like LP85s or HP100s) are mandatory, having that extra lift capacity is a critical safety margin. If you experience a drysuit flood, you need a BCD that can lift your heavy negative weight to the surface without breaking a sweat.
The Physics of Trim with Steel vs. Aluminum Cylinders
Different cylinders behave differently as gas is consumed. Understanding this behavior is crucial for setting up your trim correctly on the Katana 2:
- Steel Cylinders (e.g., Faber HP100s): These tanks remain negative throughout the entire dive. Because the weight is concentrated at the bottom of the cylinder, they tend to pull your hips down. To counteract this, you will want to mount your trim weights higher on your spine plate and position the Katana 2's sliding D-rings further back.
- Aluminum Cylinders (e.g., Luxfer AL80s): These tanks start the dive slightly negative but become about 2 to 3 pounds positively buoyant as they empty. This cause the bottom of the tank to float upward, creating a "tail-high" profile. To manage this, you simply slide the Katana 2's waist D-rings forward mid-dive, pulling the tanks back down into a perfectly horizontal position.
The beauty of the Custom Katana 2 is that its low-profile wing shape accommodates both styles of diving without requiring you to buy separate bladders or accessories. It is a true do-it-all wing for both warm saltwater reefs and cold freshwater springs.
---In-Depth Customization Options: Tailor-Made for Your Diving
One of the most appealing aspects of this system is the level of customization available. When ordering through authorized channels, you can choose from a range of color patterns, hardware materials, and weight-pocket sizes. Let's look at the options and how they affect the weight, durability, and aesthetics of your rig.
Hardware Selection: Stainless Steel vs. Aluminum
Depending on your primary diving environments, you can choose between marine-grade 316 stainless steel or anodized aircraft-grade aluminum hardware:
- Stainless Steel: This is the default choice for most divers. It is highly resistant to saltwater corrosion and provides extra weight, which helps offset the buoyancy of drysuits or thick wetsuits. It is incredibly tough and practically indestructible.
- Anodized Aluminum: If you are a frequent flyer who needs to keep your gear bag under the airline’s 50-pound limit, aluminum hardware is a fantastic alternative. It significantly reduces the overall weight of the harness, making it the ultimate warm-water travel companion.
Color Customization
While safety and performance are paramount, looking good under water doesn't hurt. The Custom Katana 2 is available in several high-visibility color combinations. This is not just for style; in dark overhead cave environments or low-visibility wrecks, having bright, contrasting colors on your harness or wing can make it significantly easier for your buddy to keep track of you.
---Real-World Testing: Field Report from a Cave Diving Expedition
To truly understand how a piece of dive gear performs, you have to take it out of the classroom and get it wet. We put the Custom Katana 2 through its paces during a week of intensive diving in the freshwater spring systems of North Florida. This environment offers the perfect testing ground: tight limestone restrictions, deep sinkholes, flow conditions, and long, multi-hour run times requiring absolute comfort.
Check out this detailed video overview illustrating how the Katana 2 performs under water and how to configure the harness.
Day 1: Harness Fitting and Initial Buoyancy Check
Out of the box, setting up the Q-Fit harness took less than fifteen minutes. After threading the excess webbing and adjusting the shoulder friction plates, the rig sat securely on my back. For the first dive, I used dual aluminum 80 cylinders. Slipping into the water, I noticed how cleanly the bladder lay flat against my back. There was no "tacoing" (where the sides of the wing wrap around the cylinders), which is a common flaw in wide-profile wings.
Executing a standard bubble check and valve drill, the accessibility of the manifold valves was outstanding. Because the Katana 2 keeps the cylinders tucked firmly into the armpit pocket, reaching back to shut down a simulated free-flowing regulator was quick and unobstructed. The low-profile dump valve on the bottom left of the bladder was easy to locate with a gloved hand, allowing me to vent small amounts of gas to control my descent smoothly.
Day 4: Pushing into the Overhead Restrictions
On the fourth day of testing, we took the Katana 2 into a cave system with several famous tight bedding-plane restrictions. This is where a side mount bcd truly proves its worth. Crawling through a horizontal squeeze that was barely eighteen inches high, the durability of the 1000-Denier Cordura shell was immediately put to the test. I could hear the fabric scraping against the limestone ceiling above me.
Thanks to the low-profile bladder design and the secure bungee system holding the cylinders, there was zero snagging. The inflation hose, routed over the left shoulder, remained protected and didn't get caught in any overhead crevices. My trim remained perfectly flat, allowing me to use modified flutter and shuffle kicks to glide through the restriction without kicking up silt from the floor. The comfort of the padded shoulder covers and backplate meant that even after ninety minutes of swimming against a mild flow, I had no hot spots or chafing on my shoulders or collarbones.
---Community Consensus: What Diver Forums and Reviews Say
When purchasing high-end life-support equipment, it is always wise to look beyond a single review and see what the wider diving community has to say. We combed through active diving forums like Reddit's r/scuba and reviewed public consumer feedback to get a comprehensive picture of how the Custom Katana 2 performs in diverse hands.
Insights from Reddit's Diving Community
In a popular Reddit discussion on the best sidemount BCD, several experienced cave and technical divers chimed in on their experience with the Katana series. The general consensus was highly favorable, with users pointing out several key benefits:
- Trim Simplicity: Multiple users noted that the Katana 2 requires less "fiddling" to get a perfect horizontal trim compared to rival systems like the XDeep Stealth or Hollis SMS75. One user commented, *“The Katana 2 just naturally puts you in trim out of the box. You don't have to spend five dives moving lead around to stop your feet from sinking.”*
- Robust Build Quality: Divers who actively squeeze into tight rust restrictions in deep shipwrecks praised the abrasion resistance of the outer bladder shell, noting that after years of hard use, they had experienced zero bladder leaks.
- Ease of Travel: Several commenters highlighted that when configured with lightweight aluminum hardware, the system packs incredibly flat in standard carry-on luggage, making it a favorite for warm-water technical travel.
Trustpilot and Customer Support Performance
When you buy a technical system, the merchant you buy it from is just as important as the manufacturer. Reviewing customer experiences with Dive Right In Scuba (the premier retailer for this custom system) reveals an outstanding track record of customer satisfaction.
Diver Right In Scuba maintains an exceptional customer rating, reflecting their top-tier service and commitment to divers. You can verify their verified reviews directly on their Trustpilot profile page.
Divers consistently praise the team for their deep technical knowledge, willingness to help configure custom setups over the phone, and lightning-fast shipping times. If you have questions about how to rig your new BCD, their staff consists of active technical instructors who can walk you through the process step-by-step.
---Head-to-Head Comparison: Custom Katana 2 vs. Key Competitors
To help you make an informed decision, let’s look at how the Custom Katana 2 compares to two other leading side mount bcd systems on the market: the XDeep Stealth 2.0 Classic and the Hollis SMS 75.
| Specification / Feature | Custom Katana 2 | XDeep Stealth 2.0 Classic | Hollis SMS 75 |
|---|---|---|---|
| Harness Style | Q-Fit (Rapid Adjust) | Modular Continuous Webbing | Standard Continuous Webbing |
| Lift Capacity | 40 lbs (18.1 kg) | 35 lbs (16 kg) | 40 lbs (18.1 kg) |
| Shell Material | 1000-Denier Cordura | 1100-Denier Cordura | 1000-Denier Cordura |
| Weight System | Integrated Spine Pockets (20 lbs) | Central Weight Pocket (26 lbs) | Spine weight pockets (16 lbs) |
| Dual Cylinder Suitability | Excellent (Steel & Aluminum) | Excellent (Optimized for Alum) | Good (Dual/Single back mount) |
| Adjustment Speed | Fast (Seconds via Q-Fit) | Slow (Requires manual threading) | Moderate (Standard tri-glides) |
While the XDeep Stealth is an incredible, pure cave-diving rig, its modular design can be overwhelming for divers who want a simpler setup out of the box. Its central weight pocket system is highly effective, but adjusting the harness to fit multiple exposure suits takes significant time. The Hollis SMS 75, on the other hand, is a hybrid wing that can handle both back-mount and sidemount diving. While that versatility sounds appealing, it means the SMS 75 is significantly wider and bulkier than the dedicated Katana 2, making it less streamlined when you are in a pure sidemount configuration.
The Custom Katana 2 strikes the absolute sweet spot. It provides the dedicated streamlining of a high-end European cave-diving rig, combined with the fast-adjusting convenience of a traditional North American harness system. It is the best of both worlds, engineered without compromise.
---Comprehensive Step-by-Step Setup and Rigging Guide
To help you get the most out of your Custom Katana 2, we have compiled an expert rigging guide based on the principles outlined in the official manual and our real-world testing. Properly rigging your sidemount system is the difference between a relaxing, weightless flight under water and a frustrating struggle against rolling cylinders.
Step 1: Harness Fitment and Shoulder Adjustment
Before you get in the water, put the harness on over your chosen dive suit. Adjust the shoulder straps using the Q-Fit buckles until the backplate is positioned flat against your spine, with the top of the plate sitting approximately three fingers below your prominent neck vertebra. The harness should feel snug but not restrictive. You should be able to reach your arms fully forward and cross them over your chest without feeling the shoulder straps binding.
Step 2: Adjusting the Crotch Strap
Many divers underestimate the importance of the crotch strap in a side mount bcd. The crotch strap is what keeps the entire harness from riding up on your torso when you inflate the wing under water. Thread the crotch strap through the rear attachment point, pass it between your legs, and slide it onto the waist buckle. It should be snug enough to hold the tail plate firmly down against your sacrum, but comfortable enough to allow you to bend your knees and hips fully.
Step 3: Setting Up the Cylinder Bungees
The Katana 2 utilizes a high-tension bungee system to keep the cylinder valves tucked tightly under your armpits. There are two primary ways to rig these: the loop bungee and the continuous bungee with bolt snaps.
- Loop Bungees (Recommended for standard cylinders): Loop the bungee cord around the neck of your cylinder valve, then secure it back to the chest D-ring. This keeps the valve held firmly in your armpit, preventing it from swinging out as you move.
- Independent Bungees with Bolt Snaps: This system uses a length of bungee cord permanently attached to the rear harness plate, terminating in a medium-sized bolt snap. You pull the bungee under your armpit, wrap it around the cylinder valve handwheel, and clip it back onto your shoulder D-ring. This is highly secure and makes it very easy to clip and unclip cylinders when floating at the surface of a deep pool or ocean swell.
Step 4: Configuring the Spine Weight Pockets
The Custom Katana 2 features an integrated spine weight pocket system that can hold up to 20 pounds of lead. When configuring your weights:
- Place your heaviest weights in the center and lower pockets to keep your center of gravity aligned with your hips. This naturally helps maintain a flat, horizontal trim.
- If you find your head is heavy and you are constantly fighting to keep your eyes forward, move one or two pounds of weight to the upper pockets or onto the shoulder straps.
- Always perform a proper buoyancy and trim check at the end of your safety stop with nearly empty cylinders (around 500-700 psi) to ensure you can hold your depth comfortably without floating up.
Buying Guide: Policies, Support, and Customer Protection
Investing in a custom side mount bcd is a major step. When purchasing, it is important to understand the warranty protections, shipping options, and customer support channels that safeguard your investment. By sourcing your Custom Katana 2 from an authorized retailer like Dive Right In Scuba, you gain access to several industry-leading customer protections.
Unrivaled Lifetime Warranty Protection
Technical dive gear is subjected to harsh environments, extreme pressures, and corrosive saltwater. You want to know that your gear is built to last and backed by a manufacturer that stands behind their work. Hollis provides an exceptional warranty on their materials and construction. Furthermore, if you are drysuit diving or utilizing other technical gear, it is comforting to know that Dive Right In Scuba offers an industry-leading lifetime warranty program on select premium lines. This reflects their ultimate confidence in the longevity and build quality of the gear they sell and service.
Flexible Payment Solutions
We understand that putting together a complete technical or recreational sidemount system—including the harness, wing, dual regulators, custom colors, and pocket configurations—can be a significant financial layout. To help make this gear accessible, you can take advantage of convenient payment options and a strict price-matching policy. By reviewing the payment plans and price-match policy, you can break your purchase down into manageable monthly payments, or rest easy knowing you got the absolute lowest price guaranteed in the industry.
Fast Shipping and Reliable Support
If you have an upcoming dive trip or training course, you don’t want to be left waiting for your gear to arrive. Dive Right In Scuba is famous for its rapid order fulfillment and clear shipping communication. You can check out their detailed shipping policy to find delivery estimates for domestic and international locations. If you ever have a question about your order, or if you need assistance configuring your harness before your first dive, their world-class customer service team is readily accessible. You can reach out to their staff directly via their official customer support contact page for fast, friendly, and highly knowledgeable help.
---The Pros and Cons of the Custom Katana 2 Sidemount
Every piece of diving equipment has its strengths and its limitations. We believe in providing honest, objective information so that you can make the absolute best choice for your personal diving style and needs.
What We Love (The Pros)
- Unmatched Trim Stability: The low-profile, triangular shape of the wing keeps your center of lift perfectly positioned, making it incredibly easy to achieve flat, horizontal trim without constant micro-adjustments.
- Lightning-Fast Harness Adjustments: The patented Q-Fit harness system is a masterpiece of design. It completely eliminates the tedious trial-and-error adjustment process of traditional continuous-webbing systems, allowing you to resize the harness in seconds.
- Superb Durability: The 1000-Denier Cordura outer shell is exceptionally tough and highly resistant to abrasions, punctures, and tears, protecting your bladder from the harsh realities of cave crawling and shipwreck penetration.
- Excellent Modular Customization: From custom color palettes to hardware selections and expandable weight pockets, you can build a rig that is precisely tailored to your diving environment and personal aesthetic.
- Clean Hose Routing: The system offers clean, low-profile routing options for both left- and right-handed inflation systems, minimizing the risk of snagging in tight overhead environments.
What to Consider (The Cons)
- Higher Upfront Price Point: Because of its highly customized nature, premium materials, and innovative harness technology, the Custom Katana 2 is more of an investment than basic, entry-level sidemount setups. However, we believe its long-term durability and adaptability make it highly cost-effective over its lifespan.
- Setup Complexity for Beginners: While the Q-Fit system makes adjusting the harness simple, setting up a side mount bcd for the first time still requires careful attention to tank rigging, bungee tension, and regulator hose routing. We highly recommend taking a dedicated sidemount training course with a qualified instructor to get the most out of this advanced rig.
Frequently Asked Questions (FAQ)
To help answer any remaining questions you might have about this system, we have compiled a list of the most common inquiries from divers who are considering purchasing a side mount bcd.
Is the Custom Katana 2 suitable for cold-water drysuit diving?
Yes, absolutely. With 40 pounds of robust lift and an integrated spine weight system capable of holding up to 20 pounds of lead, the Katana 2 is perfectly suited for cold-water drysuit diving. The Q-Fit harness is especially useful here, as it allows you to quickly loosen or tighten the shoulder straps to accommodate the extra bulk of a drysuit and thick undergarments.
Can I use this BCD for a single tank recreational dive?
While the Katana 2 is designed primarily as a dual-cylinder sidemount system, it is possible to rig and dive it with a single cylinder on one side. However, you will need to pay careful attention to your lateral trim, as having a single heavy tank on one side of your body can cause a mild rolling sensation. Most divers who use this system prefer to dive with two cylinders (either steel or aluminum) to maximize balance and gas redundancy.
What is the difference between the standard Hollis Katana 2 and the Custom Katana 2?
The standard Hollis Katana 2 comes in a pre-configured black colorway with standard stainless steel hardware and standard weight pockets. The Custom Katana 2, offered through specialized retailers like Dive Right In Scuba, allows you to customize the color panels of the wing, select lightweight anodized aluminum hardware for travel, customize the embroidery, and choose specific weight pocket layouts to suit your exact diving needs.
How do I wash and maintain my Custom Katana 2 to ensure a long life?
After every dive—especially in saltwater or chlorinated pools—you should thoroughly rinse the exterior of the BCD with clean, fresh water. To clean the inside of the bladder, fill it about one-third full with fresh water through the inflator hose, inflate it with air, shake the water around to dissolve any salt crystals, and dump it out through the lower pull-dump valve. Hang the BCD to dry in a cool, shaded area out of direct sunlight to prevent UV damage to the Cordura fabric.
Can I run my drysuit inflation hose off the Katana 2 system?
Yes. The bladder features multiple routing slots that allow you to clean up your hose routing. You can run your drysuit inflation hose directly from your left-hand cylinder under your arm, keeping it low-profile and secure, while your primary and backup regulator hoses are routed neatly on the right side. The system is designed to be highly adaptable to any gas-management configuration.
---The Ultimate Verdict: Should You Buy the Custom Katana 2?
After hours of detailed analysis, comparative testing, and diving in demanding conditions, our conclusion is clear: the **Custom Katana 2 Sidemount** is one of the absolute finest side mount BCD systems currently available. It successfully bridges the gap between ultra-technical cave systems and user-friendly recreational diving gear. It is robustly constructed, beautifully balanced in the water, and incredibly easy to adjust to different divers and exposure suits.
If you are a diver who values streamlined performance, demands absolute comfort on long dives, and wants a system that can grow with you from your first open-water sidemount class all the way to advanced mixed-gas cave exploration, this rig is an outstanding investment. Backed by excellent customer policies, lifetime warranties, and a passionate team of technical diving experts, your purchase of the Custom Katana 2 is a secure and smart step forward in your diving career.
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