All I can say is check out that video - very informative.
It’ll be right on the top of my list when the lights go out
Sorry, but the video was lame. The guy couldn’t even open his can without resorting to “chopping” with the opener.
Much better to see the videos which use the Victorinox Swiss Army knife. I have used the little semi-circle blade to open cans even when I had a manual one available. Swiss Army knives work great! I suspect some non-Boy Scouts aren’t even aware of what that blade does.