SKI, HIKE, BIKE & CLIMB COMPATIBLE - The Stow fits flush in ski pants and coat pockets, bike jerseys or fanny packs - flatten and roll when empty. DURABLE & LIGHTWEIGHT- Made of abrasive-resistant TPU, the Stow can be frozen and is dishwasher safe, at under 2 oz it&';s 80% lighter than most hard bottles. POCKET SIZED - Flexible bail handle for comfortable carrying, quick attachment, and filling from a faucet, lake or river. WATER FILTER COMPATIBLE - Attaches to most 28mm threaded water filters such as the Hydrapak 28mm filter kit FLIP TOP CAP - Made for drinking during activity, an easy open cap cover keeps the self-sealing silicone nozzle clean.