Hollis ATS BC, Advanced Technical System BCD 34 lbs bladder S & M sizes / 44 lbs bladder L & XL sizes Contoured, lightweight backpack w/back pad, lumbar support, and a rolled neoprene comfort neck 10lb interchangeable quick release weight pockets w/stainless steel D-rings Adjustable VelcroR cummerbund - Crotch strap  2in (5.1cm)webbing with vehicle hook ring Adjustable shoulder straps w/quick release buckles - Right shoulder pull dump