How could anyone thought of this before ? The interlock is a super-clever bike lock that fits in the seat post which is sold with the lock. Although it’s a bit thin, It doesn’t add an enormous extra weight and can be really useful if like he said in his video, you just want to stop and buy an ice cream, and don’t want to leave your bike alone. I’ve been in this situation, and I can tell you how unpleasant it feels: you’re stressed you don’t enjoy the moment, you think someone already stole your bike. As always, those astonishing ideas come to us from our beloved kickstarter.