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Aonijie UTMB 12L Hydration Vest with Flasks - Limited Edition Deal professional trail running backpack (≈244g) enables a lightweight design to reduce the outdoor burden. It uses dynamic fitting tech for stable, shake-free wear. With scientific multi - compartment storage, front compartments hold salt pills, two 500ml water bottles, a GPS - dedicated compartment, a double - zipper 6 - inch phone compartment, and an energy compartment; rear stepped compartments include a 2L hydration bladder compartment, large main compartment, outer zipper compartment, side storage, etc., and support two trekking pole mounting methods. Made of checkered mesh, breathable mesh with YKK zippers, it’s dry, breathable, and durable. Plus, it has easy-access side storage, fits double 500ml water bottles for quick hydration, an anti-loss zipper phone compartment, an energy compartment for timely replenishment, and a free eco-trash bag. Suitable for trail running, mountain climbing and cycling.