A handy, lightweight soft flask with a Push/pull locking bite valve, you will get the most from if used in conjunction with a running vest. OMM says OMM 500ml flasks are flexible and compress down in volume as you drink. Eliminating water sloshing/bouncing. Available in bite valve and straw options. Our Verdict Exclusively for trail runners or hikers who wish to take advantage of the straw which, allows for easy drinking without removing the bottle from the vest. I love that the collapsible bottle is only as large as required so they can be stored easily, but this also reduces sloshing and bouncing. The lid has an easy-grip cap, is simple to remove, and the large mouth makes filling straightforward, but also easy to mix in a powdered energy drink. It has a good flow rate, and the body of the flask is made from a Polyurethane (TPU) constructionand is very strong. – Reviewed by Ultralight Outdoor Gear Features Compresses as your drink reduces Slim and lightweight, easy to fill and clean Polyurethane (TPU) construction Non-toxic plastic No Bisphonol No Phthalates BPA free Specifications Weight: 48g Volume: 500ml

A handy, lightweight soft flask with a Push/pull locking bite valve, you will get the most from if used in conjunction with a running vest. OMM says OMM 500ml flasks are flexible and compress down in volume as you drink.