Made from durable proprietary fabrics, webbing and impact resistant hardware the Back Assembly is available in three sizes for complete customization and will fit any of the air cells you choose.  The Back Assembly also includes Aqua Lungs GripLock Tank Band. This band is a strong, secure way to attach the cylinder to the BC. Gone are the days of complicated web weaving through multi-slot buckles. Predetermined detente settings make set-up simple. No adjustments are necessary when switching cylinders of the same diameter.  ModLock connectors easily click into place and are simply unlocked with a small tool such as a key or pen. Comes with assembly instructions.