They were heavy duty, lined, steel cans, and not the thin Alum. ones everybody uses now days.
The can itself, and the process to close/seal it is much more expensive there by being less profitable to produce.
The 'easy open' feature further thins the can's wall thickness on the lids.
We end up with a very thin, softer, and more fragile can.
Storing stuff in the cold will help too.
One of the expeditions to the S. Pole not too long ago found 'left overs' in Adm. Byrd's old camp.
They ate canned goods from 1928 made with the old processes that were still good.