yes, if you remember in ww1 or 2 they didnt have the p38s yet and had to open them with knives, or even shot them open!
The p38 can opener is such an outstanding invention! I used one for years. I must go out and find one.42. a good hatchet or folding hand saw-
if you plan on heading to the forest like myself, these will be good for clearing branches and various other uses including using it as a weapon!
Great advise for the hatchet and saw especially since carrying a chainsaw may be a bit much. plus the noise might give your location away.