HYDRAPAK reservoir bladder and drink system included Sleek Air Flow profile with multiple organization pockets and separate hydration sleeve Posh top drop-in audio pocket with headphone exit port Multi-use large main compartment Bottom zippered rain hood pack cover Adjustable padded shoulder straps and hide-away adjustable waist belt Deluxe back padding with air flow channels for ultimate comfort 70 oz/2.0L Bladder ? FDA Approved Polyurethane MATERIALS 600D Poly PU2 / 420D Dobby Poly PU2 / 400D Nylon PU2 Dimensions 8"H x 13"W x 19"D Weight Capacity 1950 Cu.In