There are many ways to secure your bicycle when away from home, and the FoldyLock appears to be one of the better ones. It’s a 90cm (35.5. inch) long lock made up of “six hardened steel links covered with plastic reinforced with fiberglass to protect your bike frame from scratches. Connecting rivets are designed with VSR rivet technology against drilling. Foldylock is rust free and has an anti drilling cylinder that is protected in a hardened steel housing.” You can pack it tight and carry it where the water bottle would go in its designated case, or just toss it into a backpack. Hardened steel is hard to cut, but more importantly, the tough appearance of the Foldylock may deter would-be thieves just by looking harder than normal to defeat. They’re more likely to move on to the next guy tying his bike with a flimsy chain than they are to try and cut through solid steel.
The Kickstarter is fully funded, but you can still get your own for $80.