Scarce WWII USAAF Type E-17 'Bale Wire' Survival Kit Flask (empty)
It is a survival kit / ration bottle where rations are initially stored such as chewing gum, boullion, chocolate, sewing kit and some other things that have to stay dry, you can also use this to put water in it, then it is a water bottle and yes it is an essential part of your personal items that you have with you as a pilot if you have to survive .....
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