Hydrapak PackFlask

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Hydrapak PackFlask offers fast, hands-free hydration for trail running, hiking, and fastpacking with its collapsible soft flask and stretch mesh pouch that clips to pack harnesses. This ultra-low-profile system features a high-flow self-sealing nozzle for leakproof sipping on the move, collapsing small when empty for minimal pack weight. Key Features Collapsible TPU Flask: Shrinks as you drink (500ml: 32g; 750ml: ~93g); abrasion-resistant RF-welded seams. Stretch Mesh Pouch: Secures flask to shoulder straps; doubles as pocket for phone, snacks, or map. High-Flow Nozzle Cap: Self-sealing silicone bite valve with dust cover for splash-free, one-handed access. Thumb-Lock 28mm Cap: Easy open/close prevents leaks; wide fill port for ice or quick refills. Versatile & Durable: BPA-free materials; fits most vests/packs; working temp up to 140°F. Show more