If you don't practice occasionally you can mess up even a can of beans. My son had a couple of buddies go camping on the Ft Custer Recreation Area. http://www.mappery.com/Fort-Custer-State-Park-Michigan-Site-Map

"Backpack and Beans College Guys" who are some of his flying students.

He goes to see how they are doing and has to loan them his P-38 (as they left the can opener at home). A P-38 is not as nice as the can opener you posted about but it works every time.

Tom V.

I think a lot of input into the early books came from Colonel Whelen. He designed a very nice tent. He also preferred a small knife to a larger one.

https://www.frostriver.com/shop/whelen-lean-to-tent/