600D polyester, LDPE; LEVELED? strap system guides you to assure straps are adjusted evenly for balanced weight distribution; Side handles & vented back panel make it more comfortable to carry; Large underlid pocket & concealed side pocket for added storage; Armour Stash catch-all bag that hooks to exterior pocket for added storage; Molle webbing attachment points make it easy to clip on your keys; 12.7"w x 17.7"h x 7.6"d