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I keep mine in my wallet and the 2-position wrench has already come in handy for a quick bike adjustment. The saw blade is tiny but surprisingly effective on small branches.

The butterfly screw wrench is surprisingly sturdy for something that lives in my wallet, and I love having the can opener handy for camping. It's saved me a couple times when I needed a quick tool but didn't want to carry a whole kit.

The saw blade on this little card actually cuts through small branches without any trouble, which surprised me. It's slim enough to keep in my wallet behind my ID, so I always have a can opener and wrench handy.