CNOC 28mm Hydriam Collapsible Water Bottle 750ml

The CNOC 28mm Hydriam 750 ml is the largest model in the 28 mm collapsible Hydriam line, with 750 ml capacity at just 28 g. It pairs a rigid plastic neck with the standard 28 mm PCO thread (compatible with Sawyer and Platypus filters) and a soft TPU body that folds down to roughly 10 × 4 × 4 cm once empty. The larger volume compared to its 350 ml and 500 ml siblings makes it a more practical choice as a primary water reservoir on trek, especially when filtering directly through the neck — skipping the step of decanting into another container. The material is food-grade and BPA/BPS/BPF-free, with a single-wall, uninsulated construction. The bottle has no carry loop, so attaching it to a pack is up to your own setup. The rigid neck makes filling and filter attachment easier, but once filled the body stays soft and pliable — this isn't a substitute for a rigid bottle if you need something that resists compression in a side pocket.