The quintessential bike hydration pack with the convenience of external fill via the quick-release flap on the front of the pack. Holds the industry-leading 2L Antidote reservoir. One small zip pocket on front holds keys and other essentials. 1/4 turn - easy open/close cap, lightweight fillport, dryer arms, center baffling and low-profile design, patented Big Bite Valve, HydroGuard technology, PureFlow tube, easy-to-clean wide-mouth opening. External fill, essentials pocket, reflectivity. Hydration capacity: 70 oz / 2 L. Dimensions: 14.75 X 9.625 X 4 in / 37.5 x 24.5 x 10 cm. Materials: lightweight mesh.