UltraFlask® X Hydrapak 500 ml

Most flasks carry your gel. Ours helps you dose it. Developed with Hydrapak and custom-graduated by Pyrène, the UltraFlask 500 ml allows you to portion your carbohydrate intake to the nearest milliliter — in your hand, mid-race, without equipment or mental calculation. You always know how much you've taken and how much you have left, to stick to your strategy from start to finish.

Its cylindrical shape changes everything in daily use: it's easier to handle, slips more easily into trail jacket pockets, and most importantly, cleans effortlessly—no nooks where gel can stagnate, resulting in significantly better hygiene over time. The 500 ml format makes it the ideal companion for long distances and ultra-races, when you need to carry a significant reserve independently.

Regarding the nozzle, you have a teat for drinking on the go, combined with a locking pin that completely cuts off and opens the flow. This puts an end to leaks from classic teats: whether in transit, on your belt, or in your bag, you close the pin and nothing leaks. You open, you suck, you drink.

Highlights

• Exclusive Pyrène graduations: precise dosing without a scale
• Cylindrical shape: easier to handle, fits better in a jacket, cleans easily — more hygienic
• Teat + complete flow shut-off pin: zero leaks during transport and storage
• Flexible and compressible: folds up when empty, stores anywhere
• Reusable, BPA and PVC free
• Ideal format for long distances and ultra-races

Features

• Capacity: 500 ml (up to ~12 gel servings per flask)
• Materials: TPU, polypropylene, and POM — BPA and PVC free
• Graduations for quick gel dosing.
• Wide opening for easy dosing of DrinkMix and electrolytes. 

Tip: fill your flask with the dose calculated by our calculator (or your Metabolic Scan), and let the graduations do the rest.