Cactus Jack Medium 603 Backpack 600 Denier Polyester33 Liters ACU. Main 2-way zippered compartment measures approximately 20in x 14in x 6in. Front zippered pocket measures approximately 15in x 12in. Approximate capacity 33 liters. Specifications for Cactus Jack Medium 603 Backpack: Manufacturer: Cactus Jack Size: 20 x 14 x 6 in Pack Size: One Size Gender: Unisex Pack Application: Military Pack Type: Backpack Capacity: 33 liters Pack Volume: 33 liters Hydration Compatible: Yes Fabric/Material: Heavy-duty 600 denier polyester 600D Polyester Body Material: PU Age Group: Adults Width: 14 in Height: 20 in Pockets: Yes Pack Loading: Top Depth/Thickness: 6 in Application: Military Package Contents: Cactus Jack Medium 603 Backpack Cactus Jack BG603A: Medium 603 Backpack 600 Denier Polyester33 Liters ACU