Big training backpack ADCCPitbull West Coast Large Training Backpack ADCC foldable design made of thick and strong synthetic fabric resistant to abrasions and damage can be converted into a shoulder bag after attaching the included strap adjustable soft shoulder straps can be hidden in a dedicated pocket two very spacious main compartments additional inner zip pocket for small items with mesh lining ventilated bottom compartment for shoes or post workout clothes extra zippered