This Compressport favourite is already well-known by all UltrRun S Pack users but is now available as a single product: the Ergoflask 500ml is designed with ambitious trail runners in mind and fits either in a pack or Freebelt for easy hydration on the go. The fast-flow bite valve make drinking a breeze so you can focus on where you’re putting your feet, while the cap is guaranteed leakproof so you have no nasty surprises. With its intuitive screw cap, the flask is easily and quickly filled at aid stations so you don’t waste precious seconds. Its flexible material shrinks as you drink, ensuring it takes up minimal volume when empty. 100% PVC and BPA-free, the ErgoFlask is also eco-friendly and durable so you can safely use, wash and use again. Simply place it in the dishwasher for easy cleaning after your run. Ideal for longer distances thanks to its 500ml capacity, this model completes our Ergoflask range so you can switch between larger and smaller flasks depending on race distance or aid stations to stay light and efficient on the trail.