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Stay light and fast with the low-profile Siren?. Ergonomic design, external access to the OMEGA? Reservoir makes this sleek design popular with those on the bike or off. Compact footprint and shorter length makes it great for smaller torsos. Wicking mesh back panel keeps you comfortable. Storage compartment holds tube, tools, and energy bar. Strap management secures loose webbing. Secure zip pocket holds keys and essentials. Includes the patented Ergo HydroLock?. Includes sternum strap for increased stability. Reflectivity for increased low light safety. Fully insulated to keep liquid cool for hours. Machine washable. Capacity: 50 ounce Color: Blue