HydraPak SoftFlask Speed 500ml - Compressible Soft Flask Water Bottle, for Hydration Vests and Running Packs with Easy Open Cap (500ml/17oz)

["FITS HYDRATION VESTS AND PACKS: Soft material and an innovative pinch-welded base creates a low-profile tapered flask. Fits easily in most hydration vests, belts or pack pockets.","COLLAPSIBLE FLASK: Soft material conforms to any pocket, and shrinks as you drink to reduce movement and pack away easily when empty.","PERFECT FOR AID STATIONS: SoftFlasks are equipped with our SpeedFill Cap designed for quick and easy refilling at aid stations. A side tab pops open the cap in one motion and snaps shut with a click.","FILTER COMPATIBLE: Compatible with 42mm threaded backcountry water filters including the UltraFlask+ Filter Cap.","BEYOND LIFETIME WARRANTY: If you experience any issue, we’ll repair or replace the item for free. Whatever it takes to keep your adventure going."]