Me wife throws away anything that is passed the use by date so this option is out for me. So I can only stack “non-perishables”.
Tinned tuna doesn't go off.....it evolves into..... Surströmming (pronounced [²sʉːˌʂʈrœmːɪŋ]; Swedish for 'sour herring') Guaranteed no-one will want to share this with you.
Gotta diversify! One of everything to trade and one gold coin to remember the old days by when it's worth nothing anymore.