Free Soldier Military Style 3 Day Molle Large Transport Backpack MOLLE compatible, hydration bladder compatible. 3 separate "self-healing zipper" compartments. Several compression straps, sleeping mat/bag straps, contoured shoulder straps, several D-ring attachments. One bottle holder is included . Material:Water-resistant 900D polyester; Capacity: 40L; Dimensions: approx. 20"x16"x9" .