The Alpha Back Mount configuration stays the same no matter how many tanks you use - Single, Double even Multi Stage. All adhere to UTD/DIR principles and standards of minimalism with the long hose as the primary donateable regulator and a backup necklaced regulator.
The Alpha/Delta and Alpha Doubles trim (wing) device contain baffling to prevent them from 'ballooning' and/or wrapping around the tank(s). The Trim Devices (named appropriately) promote perfect trim by securing the wing tightly to the body, giving you more stability underwater.
The system uses a SS backplate (for weight) or Z-harness (for travel). Each are made up of a continuous piece of 2" nylon webbing with minimal parts and failure points. They are fully adjustable to fit snuggly to your body with nothing to break.
The Alpha Back Mount System is the foundation to back mount diving UTD/DIR style. You can use either a backplate or Z-harness, a single or double trim device and any tank solution you throw at it. It is super flexible and scalable and will grow with you. Even the all new "Quick Adjust" can be easily intergrated.