An original wartime USAAF Case Flyers Emergency Sustenance Type F-1. The case is dirty and marked and a good wash would not hurt. It is in excellent order and complete with loose lid and carry handle, it is if heavy waterproofed rubberised canvas and in silver finish. It seems that these were developed in 1939 and made obsolete by 1943. For more info on this see page 277 showing info on this exact item in “United States Army Aviators Equipment 1917-1945” an excellent book on the subject. Info on this page can be found on google and describes the original contents of the bag etc. the bag shows minor edge wear.