Osprey Hydraulics 500ml Soft Flask Water Bottle - Collapsible Hydration Flask - Lightweight for Running Vests & Belts

Hydrate effortlessly with this 500mL flask, designed for compatibility with vestpacks. A WingStay™ removable stabilizer prevents bounce, while a wide-mouth opening makes it easy to load ice or mix in electrolytes. A high-flow valve, easy-grip twist cap and tapered shape simplify hydration. Crafted with durable TPU and RF-welded seams, and compatible with the UltraFlask Filter Cap (sold separately).

• INNOVATIVE SOFT FLASK: Designed for seamless vestpack compatibility, this tapered 500 mL soft flask with bite valve includes a WingStay Removable Stabilizer for a bounce-free run.
• WINGSTAY REMOVABLE STABILIZER: Adds structure to prevent the flask from folding and bouncing, even when empty. Simplifiies inserting into vest pockets and ensures flask is seated in the ideal position. Removes and installs quickly, and cleans easily—top rack dishwasher safe.
• EASY LOADING: The large 42 mm opening enables quick ice and drink mix loading into the flask. The tapered flask shape streamlines pocket loading, even mid-stride.
• HIGH-FLOW, SELF-SEALING: Hydrate easily on the move with a high-flow, self-sealing bite valve that requires zero fuss.
• BUILT TO LAST: Made for the miles ahead with durable TPU- and RF-welded seams.