This is the COiN: a coin-sized keychain knife about the size of a quarter that you can easily take with you anywhere. It is tiny enough to fit on your fingertip but you can use it to cut ropes and open bottles. It has rounded edges, so you can carry it with you anywhere without having to worry about accidental cuts. You can order this with a stainless steel or Titanium body.
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This tiny blade is designed as a perfect fit for your keyring. It has a 4.2mm gap, so it can fit larger rings. You can also attach it to your carabiner. Something this tiny can still be used to open packages, mark leather, slice a piece of fruit, and cut a fruit. You can find this project on Kickstarter.
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