Fairly often, I need to open a sealed box, but I don't have a sharp knife handy.
The box is typically sealed with packing tape or fiber tape.
My solution is typically to grab my keys and use a key as crude knife. But keys are not very sharp, so they don't work too well.
They do sell small knives that can attach to your key chain, but I really don't want the bulk of that, nor do I want to have to remember to remove it every time I fly on a commercial airplane.
What is a good life hack to open a sealed box when you don't have a sharp knife handy?