I used some shrink tubing to keep my can opener closed. Thereīs no need to feel silly about a can opener on the key chain. Many people have truely useless items on their key chains.
On one occasion my can opener was extraordinarily useful. A coworker tried to demonstrate how silly I am. He took a can with his would be breakfast, reached for the pull ring while telling how useless my can opener was in the age of pull ring cans. Everybody around laughed out loud when he discovered that this particular can was the old fashioned style. Being a generous person, I permitted him to use my can opener free of charge.
BTW: That can opener earned me a couple of food offers from people who had canned food but no can opener.
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If it isnīt broken, it doesnīt have enough features yet.