Hydrator Backpack Hydrator BackpackModel 25505FEATURESBack Panel mesh over molded ventilated foam with integrated air channelsDaisy ChainVertical front zipperDual mesh water bottle pocketsMicroban anti microbial bladdertubebite valveincludedInternal organizer in front pocket2 Main compartmentsHelmet storageBike pump pouchSternum StrapSpecificationsSize 17 x 6 x 9Capacity 650 cu.in.