tins, then and now?

[vassili]

Read a couple of places now about tins "back then" where heavily tinned, that's why the food was still edible thirty or whatever years later. But tins now supposedly only have a thin layer of plastic inside them, and therefore the contents will have a drastically shorter shelf life. Urban myth?

[tigs]

its not the thickness of the tin its whether its air tight that counts , if it is the food will last due to it being pressure cooked and killing off any bacteria