This is the XS Scuba Standard Backpack Features: Traditional single tank backpack Blow-molded plastic construction 2 (50 mm) black harness webbing Adjustable tank band with cam buckle Will accommodate 6.9" (175 mm) to 8.0" (203 mm) cylinders SS quick-release at shoulder and waist Built-in carry handle Overall length 15" (38 cm) This backpack design is one of the original styles manufactured. Harness, standard hard-plastic pack with 2" (5.1 cm) nylon webbing assembly, Soft tank band and cam buckle is easy to duff and don."