Osprey's Duro Handheld Soft Flask Holder provides a high-performance h&-held hydration solution to any active outdoor user. The Duro Handheld is designed to provide h&-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. It's easy to use, ambidextrous & comfortable, featuring a zipped stash pocket that's ideal for storing keys & a little cash or a bank card. The zip pull doubles as an emergency whistle, while the contact mesh lining allows it to be comfortable & breathable against the skin. It can be worn in the palm or on the back of the h&, allowing it to be used along with trekking poles.