Spam and ramen noodles. Never need salt.If the wrapper gets punctured then they will go moldy but that's all I've seen.
Great for a leftover dish base. I add leftover meat or an egg, frozen veggies, and some spicy kimchi and its awesome.
I believe that the package is the weakest point, double bag the noodles, keep them out of the sunlight and they'd probably outlast humanity.