A few weeks back I walked from St Austell to Falmouth with my Dad and younger brothers. Have not used my proper rucksack for about twenty years. Opened the top pocket and found a vegetable cup a soup form 1996. My and my youngest bro were curious and so made it up. Smelt fine, looked fine. So we both ate some and were fine (Disclaimer - Do not try this at home unless you are a bit daft or bloody really hungry)