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Have you ever used a key for a sardine can? IMHO easier and simpler. http://i.istockimg.com/file_thumbview_approve/14389354/2/stock-photo-14389354-empty-sardin

• dragonwriter 12y ago
  Sure, but it still requires the same kind of prescored lid; even with a key, I don't think that general design approach scales up very far while still not being too much of a hassle for consumers to bother with if there are competing products that are more convenient to open.