Detailed Features:stretch mesh back panel with airflow system helps keep your back cool and dry2 liter / 70 ounce hydration system with a wide opening reservoir for easy filling and cleaningSystem is BPA free and antimicrobialInsulated hose cover prevents water from freezing in the tubeElastic loops for convenient hydration hose positioningMultiple front load storage compartments for holding gearFront pocket has organizer with keyfob and can hold bicycle tools and accessoriesStretch mesh front pocket for external storageTuck away mesh sport flap holds a helmetAdjustable side and bottom compression straps stabilized loadPadded shoulder straps with sternum strap and load lifters for added comfortWaist belt with dual zippered pockets provide quick and easy access to essentialsreflective loop holds a bike LED blinker for safetySpecifications:Pack Size: 18" x 8.8" x 4"Pack Capacity: 14L / 854.3 cu. in.Reservoir Capacity: 2L / 70 oz.Materials: Super Light Shiny - Grid Nylon RipstopInternal frame