Big training backpack HilltopPitbull West Coast Large Training Backpack HILLTOP fold out construction made of thick and durable synthetic fabric resistant to abrasion and damage when unfolded, can be used as a shoulder bag with the included detachable strap adjustable padded shoulder straps can be hidden in a special compartment two very spacious main compartments integrated hard case for glasses additional inner zip pocket with mesh divider for small items ventilated bottom