For my back-up, I'm currently using a large (32 oz) Pirouline cookie SS can with tight fitting SS lid, which holds a med size tin can (1078 mL) which is nested with a small tin can (458 mL) homemade woodstove. (Inside the little can also goes a lrg garbage bag, 1 piece aluminum foil, 2 tea lights, a mini bic, 1 fire steel, 1 tube of vaseline, a film canister of strike anywhere matches and cotton balls.)

The Pirouline can holds every very nicely and it all nests together. It's a pretty light set-up and I can use both the large cans for boiling and cooking in if I need to.