The osprey duro handheld duro handheld is designed to provide hand held hydration whilst leaving your fingers free to adjust your jacket or open an energy gel duro handheld contains an interchangeable 250ml soft flask with sports cap for fast flow easy to use ambidextrous and comfortable duro handheld features a zippered stash pocket ideal for storing keys and a little cash or a bank card its zip pull doubles as an emergency whistle duro handheld is lined with contact mesh allowing