If you’ve ever been in a situation where a knife could have made life easier – such as in the case of needing to open something, especially that packing plastic that’s just impossible, then you can relate to why the Cardsharp is a great idea. The Cardsharp4 is a blade that fits into your wallet, about the size of a credit card. When folded out, the blade measures 25mm in length, which is perfect for most times where you might need a knife in a pinch. This fourth iteration of the Cardsharp is made of machined aluminum and has new features that didn’t exist in previous models.

You can order one for $90 from their website.