Designed to carry any 100oz bladder on the market today. Opening for the bite valve and drinking tube is large enough to fit any bite valve without taking your mouth piece apart. Full zipper closure. Pile tape across the top for unit patches, name tapes, glint tape, and blood types. PALS webbing for attaching extra pouches if needed. Backed with a lifetime warrenty. Size 17.5" x 8.5" x 1.5".