USWE

Ultraflask 0.5L

What Our Gearhead® Experts Are Saying:

"I’ve used a lot of soft flasks, and this one stands out because the drink tube actually makes a difference—you can sip without pulling the flask out or breaking form. The TPU is seriously tough, and the RF-welded seams hold up to repeated freezing and refilling. It’s become a staple for my long training days."

Designed for runners who want efficient hydration without the bulk of a full reservoir, the USWE Ultraflask 0.5L brings durable construction and on-the-move convenience to endurance efforts. Its abrasion-resistant TPU and RF-welded seams allow the flask to flex, compress, and withstand the repeated stress of long training blocks, while remaining safe for everything from ice-cold water to warm mixes.

The extended sip tube and bite valve offer quick hydration during tempo efforts, climbs, and technical trail sections, eliminating the need to slow down or fumble with pockets. Seamlessly compatible with USWE running vests such as the Pace, the flask sits securely upfront to maintain balance and reduce bounce as it compresses. For runners tackling ultras, vertical gain sessions, or long-distance conditioning, this 500mL flask delivers race-ready performance in a compact, reliable design.