This a rare ethyl cellulose container for an E-3 Emergency Sustenance Kit, a type of personal aids kit developed by the U. Army Materiel Command and issued to aircrews during World War II. Key details visible on the container. These kits were designed to be compact and easily hidden, often carried in a jacket pocket for escape and evasion purposes. They typically contained items like malted milk tablets, water purification tablets, chewing gum, a hacksaw blade, matches, adhesive tape, and a brass compass.
This belonged to my father who flew the Burma Hump in WW2.