COLLAPSIBLE & SPACE-SAVING DESIGN: Flattens and rolls when empty to fit in ski jackets, bike jerseys, or small packs; also serves as an emergency backup water container during outdoor adventures or travel. LEAKPROOF CAP & SELF-SEALING NOZZLE: Ergonomic silicone nozzle designed for spill-free drinking; protective flip top cap keeps the drink valve clean from debris. ULTRALIGHT & RUGGED: Weighs under 2 oz, 80% lighter than hard bottles. Abrasion-resistant, freezable, and dishwasher safe. Reliable everyday and backcountry use. FILTER COMPATIBLE: Attaches to HydraPak 28mm filter kit, making it ideal for backpacking, camping, or off-grid travel where clean water is essential. EASY TO CARRY: Flexible bail handle for comfortable carrying, quick attachment and filling. Compact enough to stash away in pockets, pouches or small packs.