18 x 9 x 19"h. 600D polyester material Padded, adjustable shoulder straps,Padded, adjustable waist belt with quick-release buckle Large zip main area with hydration bladder pocketFull-length opening for easy packing 2 large zip side vertical pockets,Padded mesh back,3 internal compression straps External quick-release buckle cinch straps Modular webbing across front and sides for attaching accessories. Material: 600D water resistant Polyester. All packed 20/Case.