A cupboard full of tinned food is a preparedness cornerstone — but it's useless if you can't open it. Electric openers die with the power, and ring-pulls fail or aren't on everything. A simple, robust manual can opener is the humble tool that unlocks your entire tinned reserve, and it costs next to nothing. It's the classic thing people forget until the moment they need it.
It needs no power, doesn't break easily, and takes up almost no room in a drawer or kit. For the sake of a few pounds, it removes a genuinely frustrating single point of failure in any food store.