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Collapsible, Lightweight Design. Soft flasks are made from flexible materials that collapse as you drink, which reduces liquid sloshing and keeps the bottle compact when partially full — great for running, trail running, and races. Durable & Safe Materials. Typically this runners water bottle made of thermoplastic polyurethane (TPU) — a strong, abrasion-resistant, and flexible material that is 100% BPA- and PVC-free for safe hydration. High-Flow Bite Valve or Nozzle. Flexible soft water bottles have a bite-activated valve that prevents leakage and lets you drink easily while moving. Many also include a twist-lock mechanism to fully stop flow for transport. Compatibility & Versatility. Foldable running water bottles are great in handheld use, running vests, belt pockets, or backpacks because their shape conforms to different spaces, Typical weights for a 500 ml soft flask are very low, making them ideal for long runs where every gram count. So, its best gift for hikers. Easy to Pack When Empty. Once the fluid is gone, the flask collapses completely — very space-efficient in gear pockets or backpacks.