Have your U-Lock by your side. Literally.
HIP BAG Bicycle Waterproof Belt Pack Black Cordura U Lock
Review: Trakke U-Lock holster
This is the AURORA U-Lock belt., It takes U-Locks with a width around 10-13 cm., The lenght is adjustable from around 70 cm up to 105 cm., It's
U-Lock Belt
Bike Lock Wiki
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Small U-lock Holster