Even when keychain tools are useful, they're often too oversized to fit comfortably in a pocket. Thankfully, a few very small tools exist and many of them are shaped like the keys you already use.

Size and Weight Above all else, keychain tools must be portable and lightweight, ideally no more than 2.5 ounces. The majority of the keychain tools we write about weigh less than one ounce.

Your key chain takes up the most room in your pocket but is also the least useful thing you carry on a daily basis. But clip the right tools to that key chain and it becomes an indispensable asset ...

The Driver packs a surprising amount of functionality within its space-efficient 2.5-inch body. Gerber Thankfully, lots of brands sell defanged multi-tools that will never land you in this trap. Given ...

Kaufmann’s EDC kit might fit on a keyring, but you might not want to put it in a pants pocket thanks to all those sharp edges. Keeping the compact tools in a bag or jacket pocket, though, might ...

Smaller than your pinkie but with the strength to haul a full-grown adult, this device is a seriously handy powerhouse.

9. Compact keychain If you've only got a few keys, and an eye for something different, you don't have to go with the typical ring-shaped chain. You really only need washers and a rivet to create a ...

We’ve found five bottle openers that are small enough to be unnoticeable on your key chain but so beautiful that you’ll look for an excuse to use them. Handgrey MO.25 ($20) (Courtesy Handgrey) ...