DIMENSIONS - 18.5" x 11.5" x 5.5" (47cm x 29cm x 14cm) 100% Polyester 600D with TPE Coating / Polyester X-Ripstop w/ TPE Backin 4 compartment backpack with separate zippered laptop compartment and large main w/ internal organization Front zipper entry compartment with internal keyclip and accessory holder, Flat front zip pocket w/ tricot liner Structured padding throughout, lower cinch straps for external tethering, and elastic compression water bottle pockets.