When it is nice out, I ride my bike to work several days a week. One of the big annoyances is dealing with my lock. It's heavy to keep in my shoulder bag, but too bulky to keep on the frame.

The InterLock on Kickstarter is designed to solve this issue.

The lock hides inside of the bike's frame through the seat post. The lock slides out of the post (which comes in the kit) for use, but tucks away neatly when riding.

The backer price is just $39, and the lock will retail for $50 if funded.