The original spacer wasn't ideal for my seat post carrier, so I designed a better one for my ORTLIEB-ROSE - Sport-Roller QL1 CLASSIC (12.5l) panniers. The original spacers were more for urban fair-weather cyclists and not for unpaved terrain. The bags kept coming into contact with the rear tire, my spacers increase the space between them and the tire.
The author marked this model as their own original creation.