Hydrapak Stow Flexible Bottle - Mountain Edition - Redwood (350ml)Features: POCKET SIZED Goes where most hard bottles wont fit. The soft material conforms to your pocket and eliminates that hard bottle bounce. PACKABLE Minimal design and durable construction allows you to flatten and roll when empty and stow into the bail handle. FILTER COMPATIBLE Attaches to most 28MM threaded water filters, including the HydraPak 28MM Filter Kit. FLIP TOP CAP Made for drinking during activity with an easy open cap cover and self