How To Turn A Metal Can Lid Into An Emergency Whistle
Tin cans seem too heavy and cumbersome to bring along while camping or backpacking, but there are so many clever uses for an empty can they make a great addition to your pack. Of course, you'll have to pack a can opener...
https://www.neatorama.com/2017/02/26/How-To-Turn-A-Metal-Can-Lid-Into-An-Emergency-Whistle/
