A heavy-duty bike lock you can wear on your belt or backpack.

A spokeperson at Interbike said one new trend these days is to have clean lines on their bikes, free from accessories bolted on. That's why his company came up with the Foldylock Clipster. This is said to be the first & only wearable folding lock. It hangs on your waist, or backpack, not your bike. It features a patented joint protection system and weighs a bit less than 2.5 pounds. (I weighed on my postal scale.) Watching their video of a person trying various way to break tthis hardened steel lock, it does appear to be quite secure. (That video is on their website.) It's was on preorder, but should be shipping early October. I checked their website on 10/1//18 and the lock is there for $80. Normal price is expected to be $85, but that price can start at any time.

Company website: https://seatylock.com/collections/foldylock/products/foldylock-clipster