My long term food is from Walton Feed and most of it is good for 20-25 years - hermetically sealed without oxygen.
Funny thought: You open those cans in a dire emergency; Massive civil unrest.. No other food source, etc.. And a few of those old slapstick comedy worm things pop out and go ‘boing’!
Is a lot of that Walton Feed food, wheat berries and beans, and such?