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100 ounces reversible reservoir. Elbow/Straight EasyFlo shut-off valve, quick-disconnect tube connection and Insulated drink tube. 375 cubic inches of storage. Shorter than the 2004 Hydrapak Overflow, but with the same amount of storage. Expando construction gives reservoir pocket separate expansion side wall. Large zippered main pocket with dual zipper cars. Internal gizmo pocket for storage of extra stuff. External zippered gear pocket and 6 point external bungee cord. Buckles from front pocket creates storage between the main and outer pocket. Hydratunes internal pocket and cord port for your MP3 player, disk or walk-man. Reflective light loop and piping. Removable waist belt.