Cold Steel Vapur 0.7 Liter Folding/Flat Water Bottle (Blue) BOT1A
For Size Reference
Vapur and Cold Steel have come together to bring us an "Anti-Bottle". This water bottle can stand on it's own, be frozen, and hold 23 oz. of water, but when empty, it can be collapsed. This ultra-light water bottle is a great addition to any pack.