The USGI 5-Quart Collapsible Canteen and Flotation Bladder is a dual-purpose military surplus gear originally designed for the U.S. Armed Forces (often associated with the Vietnam War and Gulf War eras). It holds a large volume of water for the field but folds down to a compact 4'' × 6'' size when empty. Key Features Water Transport: Holds up to 5 quarts of liquid. As water is consumed, the bladder collapses to reduce uncomfortable sloshing sounds and movement during tactical operations or hiking. Flotation Device: The internal bladder can be inflated with air and used to aid in water crossings or keeping a swimmer afloat. Integrated Hardware: The attached cap often features a removable metal debris strainer for collecting water from natural sources (like streams) and may be threaded to accommodate certain water filtration systems. Storage Pouch: Typically accompanied by a nylon carrier with straps/loops for attaching to a pack (MOLLE compatible) and a small outer pouch meant for storing water purification tablets.
