Hollis SMS Katana 2 – Single Bladder Sidemount System

Your Dive. With a Side of Air.

The Hollis SMS Katana 2 is a next-generation sidemount harness system, engineered in collaboration with cave diving expert Edd Sorenson of Cave Adventurers. Designed with technical precision and fit in mind, it offers performance and comfort for both recreational and advanced sidemount divers.

At the heart of the Katana 2 is the Quick Fit System (QFS)—a tool-free solution that allows quick torso height adjustment, delivering a true one-size-fits-all fit. This ensures fast and personalized setup for a wide range of body types, making the harness exceptionally versatile.

This version features a single-bladder configuration, ideal for recreational diving, drysuit use, or divers who prefer a streamlined rig with the option to upgrade later. The low-profile wing design ensures optimal trim and minimal drag while maintaining sufficient lift for various diving conditions.

The Katana 2 is also CCR-ready, and is the first sidemount harness system designed specifically for the KISS Sidewinder rebreather. Combined with the option to configure the harness in H- or Y-style, it provides complete flexibility for sidemount and rebreather divers alike.

Key Features

• Designed in collaboration with Edd Sorenson of Cave Adventurers

• Quick Fit System (QFS) for tool-free torso height adjustment

• Single-bladder configuration – ideal for recreational and drysuit diving

• Low-profile wing for better trim and reduced drag

• First CCR-ready sidemount system – supports KISS Sidewinder

• Compatible with both H- and Y-harness styles

Why Choose the Katana 2 Single?

The SMS Katana 2 Single is built for divers who demand performance, comfort, and adaptability. With Hollis engineering, intuitive adjustments, and rebreather compatibility, it offers the perfect sidemount solution—whether you're starting out or exploring more advanced technical environments.