Formula 250 Soft Flask

Your fuel delivery system — whatever that fuel happens to be.

The UltrAspire Formula 250 is a 250ml silicone soft flask built for race vests and long efforts. Water, energy drink, gels, or real food — the large-flow flip-top cap handles it all without fuss. The seamless interior design means every last drop gets dispensed efficiently, and the rounded teardrop shape makes it easier to clean and slots in and out of vest pockets quickly, even mid-run.

The 100% silicone construction is durable, flexible, stain-resistant, and completely taste and odour free — so last week's electrolyte drink doesn't show up in today's water. Dishwasher safe for easy cleaning, and the bottom loop lets you hang it upside down to dry or clip it to gear when not in use. Collapses nearly flat when empty so it takes up almost no space in your pack.

• 250ml capacity — sized for race vests and on-the-go hydration
• Large-flow flip-top cap — works with water, drinks, gels, or real food
• Seamless silicone construction — taste-free, odour-free, stain-resistant
• Teardrop shape — easy vest pocket access and thorough cleaning
• Collapses flat when empty — minimal bulk in your pack
• Bottom loop — hang to dry or clip to gear
• Dishwasher safe