This is a Camelbak Water Bottle known as the Quick Stow, model 1926001051.
Stash it in your hiking pack" bottle pouch" or even in the palm of your hand. This lightweight" collapsible flask features our classic one-piece silicone bite valve for rapid hydration on hunt day and packs down easily once it's empty. We designed the Quick Stow to fit easily in all of our hunting backpacks. Once it's empty" it folds down small enough to fit in your pocket. The Quick Stow conveniently holds 500 ml (17 oz.) of water and features the Hydrate or Die logo.
Features:
Bite valve self-seals after each drink, eliminating annoying drips
Empty flask collapses and folds ultra-compact to fit in most pockets
Cap is top-rack dishwasher safe
Volume indicators in ounces and milliliters for tracking hydration and adding electrolytes
Hang flask upside down for easy drainage and drying
500ml / 17oz Capacity