Hydrapak PocketFlask 500ml

Meet your new favorite flask for running belts or tight-fitting running vests. With a low-profile 28mm cap and a pinch-welded bottom seam, the 500ml PocketFlask is exceedingly durable and comfortable to carry. The slim profile and smooth contours of this flask make it ideal for carrying on your body while moving, reducing pressure and irritation. With running belts in mind, the cap locks with a simple thumb motion, so you can tuck it into your belt leak-free. For use with running belts, vests, or any application where a locking-cap flask would be helpful, the PocketFlask will be your best friend.

• Classic HydraPak high-flow silicone bite valve is easy to drink from.
• Locking cap prevents leaks when nestled into a belt or pack.
• Flexible design contours to your body without pressure points.

Update 2026: The Pocketflask now features a bold Hydrapak logo, a slightly different printed design, but otherwise remains the same.