Can of Tuna

Your first night in a fresh base is dark. No wires, no generator, a loot room you can barely see into. That is where a can of tuna from the day's looting pays off twice. Eat it for the small boost to health, hunger and thirst the game text promises, and an empty tuna can stays behind in your pocket.

That tin is the one part of the tuna can lamp you cannot just chop or pick up. The lamp wants it plus a little wood and low grade fuel, with no workbench at all. Hang one by the door of your loot room and you can finally tell your boxes apart.

Once the walls are lit, spare tins go into the furnace and come back as metal fragments, just like the ones from a can of beans. So keep two for lamps and smelt the rest.