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Foldable & Space-Saving Design : This TPU soft flask collapses to a small size when empty, making it easy to store in running vests, hydration packs, pockets, or bags, perfect for runners, cyclists, and hikers who need to save space during long-distance activities. High-Flow Bite Valve : The auto-seal bite valve delivers a steady water flow with each sip and seals instantly to prevent drips or leaks, no need to twist or close a cap, ideal for maintaining hydration without breaking your stride during marathon or trail running. No-Slip Grip Surface : The textured outer shell provides a secure, non-slip grip even when your hands are sweaty or wet, giving you complete confidence while holding the flask during high-intensity activities like cycling, obstacle racing, or fast-paced hiking. 100% Leakproof & Food-Grade TPU : Made from premium BPA-free, phthalate-free, food-grade TPU material, this soft flask is safe, durable, and reusable, the welded seams and leakproof cap ensure zero spills inside your running vest or backpack. Wide Compatibility for Outdoor Sports : Designed to fit most hydration vests and waist belts, this collapsible water bottle is essential for endurance training, cycling, marathon running, hiking, and travel, a reliable hydration solution for active adults.