#10 cans are freeze dried food which has a shelf life of 25 to 30 years (compared to a 3 to 5 year shelf life for MRE’s).
http://www.thereadystore.com/freeze-dried-food-storage/supply-size/10-cans
LOL I sell the Plastic Drums to this company.
Here’s another source: http://waltonfeed.com/