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.