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Perfect for a first time user. Looking for a better way to drink on-the go? The versatile HydroBak is ideal for all sorts of activities and features a low-profile, comfortable design. Carries enough hydration for 1 to 2 hour outings. External zip pocket for keys and essentials, Secure Bungee Cinch System? holds extra clothing, Low-profile design keeps pack stable and does not interfere with helmet, Soft mesh harness is comfortable and breathable, Reflectivity for increased low-light visibility. Specs: Dimensions: 13.5 in x 8 in x 1.75 in (343 mm x 203 mm x 45 mm) Capacity: 50 ounce / 1.5 liters. Weight: filled 4.10 lbs (1.86 kg) empty .80 lbs (.36 kg)