ANATOMICAL TILTED DESIGN: The flask's angled shape ensures a close fit to the body, enhancing comfort and reducing movement during activity. This design is ideal for runners looking for a hydration solution that stays securely in place. SOFT, FLEXIBLE CONSTRUCTION: Made entirely from soft materials, the flask easily conforms to pockets in vests or belts, allowing for effortless storage and retrieval. Its flexibility makes it a top choice for athletes needing a reliable and comfortable hydration option. HIGH-FLOW VALVE WITH WIDE OPENING: Equipped with a 42mm cap and high-flow valve, the flask allows for quick refills and easy drinking on the move. This feature is perfect for those who require rapid hydration during intense activities. SHRINK-AS-YOU-DRINK FEATURE: The flask collapses as you consume its contents, minimizing water bounce and enabling you to monitor remaining liquid levels. This functionality is particularly beneficial for trail runners and hikers who need to manage their hydration efficiently. SAFE & DURABLE MATERIALS: Constructed from 100% BPA, BPS, and BPF-free materials, the flask is both safe for use and environmentally friendly. Its durable design ensures longevity, making it a great choice for regular use.