TAILORED FOR RUNNERS:Ideal for marathon runners and trail enthusiasts, this soft flask fits perfectly into hydration vests during long training sessions, preventing bulky bouncing and ensuring fast, hand-free sipping. PREMIUM MATERIALS:Crafted from blue TPU material with a flexible silicone bite valve, this 27.3 x 9.75 cm / 10.75" x 3.84" flask is designed for longevity. It easily collapses as you drink to prevent water sloshing. HYGIENIC DUST CAP:Features a dedicated protective dust cap that keeps the silicone bite valve clean from trail dirt, mud, and outdoor grime, ensuring every sip is completely hygienic during high-intensity trail races. EFFORTLESS MAINTENANCE:The smooth inner wall and detachable silicone bite valve make cleaning simple. With a 40g ultra-lightweight design, the wide mouth allows for quick water filling in under 5 seconds during busy race transitions. SPACE SAVING DESIGN:Holds 500ml of hydration while remaining exceptionally compact. The reinforced bottle bottom craftsmanship provides structure when full, yet the entire blue flask folds flat when empty to save storage space. Material: TPU Size: 27.3 x 9.75 cm / 10.75" x 3.84" Color: As shown Package includes: 1pc Soft Flask