DayZ field wiki · Survive
Can opener
Cans are a lock
Short answer
A can without a tool is a paperweight. Knife, opener, or screwdriver — one of them feeds you.
Also: tin opener · open can
How it works
Most canned food needs a tool. A knife does it and dulls. A can opener is the polite version.
What to do
Carry one tool that opens cans. Eat before you push a town.
Don't
Don't hoard ten locked cans and starve in a barn.