The canteen is intended primarily for use in temperate and tropical environments for carrying drinking water.
The M-1961 combat field pack is used to carry individual rations and equipment that are essential during field operations.
Military specification MIL-C-43103 covers one type of plastic water canteen having a capacity of one quart nominal.
Military specification MIL-F-40165 covers one type and size field pack fabricated from olive drab cotton duck and webbing.