Back when I retired at the end of '08, I took money out of my 401k to buy long term food. I bought from Safecastle, Emergency Essentials and the Mormans. All in #10 cans in cases. Then from Honeyville I bought 50# bags of wheat, corn and other things. I found a good price on paint cans by the case. I bought 2 gallon baggies and packed over 100 paint cans lined with two of the 2 gallon baggies with oxygen absorbers. That was 7 bor 8 years ago, peridiocally I check a can and it wooshes when I open it and every thing is fine. I bought untold pounds of basmatti rice and pasta and packed that in cans too with about 300#s of different kinds of beans and peas. I moved all of that from Slidell to a storage unit in Natchitoches, LA and then about 2 years ago I moved it all to a storage shed here at home. Most of the individual cans are in clear plastic bags. the ones that aren't in bags have rusted on the outside, but the contents are fine.
A little at a time adds up, even if you can't afford the already packed long term food, you can package your own in small batches. The Morman cases are reasonably priced and I'd buy a case here and a case there and it builds up. I never intend to open any of those already packaged cans unless the world goes south and when I go to be with Jesus, its up to my two sons to either hang onto the food or ditch it, I hope the choose wisely.
Judy