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An E-tool is like a fancy shovel for soldiers who dig holes like it's their job. It folds up so they can carry it without looking like a total moron.
My E-tool saved my life when I had to dig a trench in the middle of a zombie apocalypse.
I tried to use a regular shovel, and it broke. Now I use my E-tool like it's my best friend.
I carried my E-tool through a blizzard and still had enough energy to punch a bear.