Constructed out of a light weight 600D Polyester 420D Ripstop with a water resistant PU coating.,Main large compartment can be separated into two smaller compartments.,Padded back uses Air Bridge system and has small zippered front pocket.,Two side mesh utility pockets and an adjustable unisex sternum and waist straps.,Internal elastic pocket for organization, inside zippered electronic pocket with earbud holder,Bottom built-in zippered rain cover compartment, bottom handle, side compression straps and a D-ring.,This pack is (H20) hydration compatible. Upgrade with the HF00 2L bladder.