Durable Polyester, hydration-compatible design w/ inner compartment and drinking tube outlet Elastic rain cover Lid w/ interior and exterior compartment Padded hip/shoulder straps & vented back padding Detachable elastic helmet holder Reflective Measures approx 13.2 x 7.5 x 18.9 inches Volume is approx 4.3 gallons Brand new with tags I’m not sure if it’s men’s or women’s??