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With 100 ounces of hydration capacity, easy accessibility, and the cargo capacity of any hydration system, the Overflow does more than live up to its name in capacity of liquid and dry storage space. Easy clean Reservoir permits easy cleaning and filling. Trap door for easy and quick reservoir access. Quick Draw Hose Fastener for fast, convenient drinking. Elastic Sternum strap. Adjustable Belt. Gulp valve permits good liquid flow and leak prevention. Reflective Vistalite Loop permits safety in low light conditions. Molded EVA Back Panel for comfort and Ventilation. Multiple cargo pockets with pump sleeve and key clip Wrap around zipper can expand capacity for those big loads. Half a dozen storage compartments.