INSTANT ACCESS: Stretch mesh pouch attaches to your park harness and securely holds the bottle for hands-free hydration. PACKABLE: Sized for easy integration with the pouch, the empty PackFlask bottle packs small–just flatten, roll, and stash it away. EASY DRINKING & DUST COVER: Made for splash-free drinking on the move with a high-flow self-sealing silicone nozzle. Dust cover protects the nozzle from dust, mud, and dirty hands. Quickly opens and closes with a single-handed flip. FILTER COMPATIBLE: Attach it to most 42mm threaded water filters to create a packable squeeze system. LIGHT AND TOUGH: Lighter than traditional bottles, and made of durable TPU with RF-welded seams.