The TIK: The World’s Leanest Keychain ($49), lets you put your keys the same places you put your credit cards. It’s made from a Yaban SLA bicycle chain and can be customized to fit as many keys as you need. The best part is that no matter how many keys you carry it will always be thin. Additional benefits include a 40% weight savings over regular key chains, greater leverage when turning in the lock, and an unlimited number of keys. The Kickstarter is offering 48 of the most popular key blanks available which covers 95% of all keys used.