With a whopping 9 litre of smart storage capacity incl a 25 litre shape shift hydration bladder the a4 challenger is designed for the hard 1 day adventures the solid 4 point suspension harness keeps the pack exactly where its intended secure on your backspecificationstotal volume 9l 406l cargo and 3l bladder41weight 563g ex bladderno more dancing monkey harness technologytwin port exit for tube from h2o compartmentshape shift 25l hydration system 4030l unzipped baffle41orga