Keys always seem to multiply. You start out with your house keys and car keys, and the next thing you know, your keychain is full and you have no idea what half of them even unlock.
If you want to make your keys lighter and less bulky, redditor mattfrancis13 has a solution. He turned his keys into a super simple Swiss Army style keychain that takes up way less space than a regular key ring.
He started by cutting off the tops and sides of the keys with a hack saw, then drilled a hole into each one.
He stacked all the keys with a washer between each one and threaded them all onto a 3/8" machine bolt to hold them together. If you're worried about being able to tell them apart, just use a little nail polish to color code them.