When combining accessories and adapters, the low load capacity / payload is relevant.
Rackpack · black
self supporting carrier rack
Self-supporting aluminium rack for seat posts Ø 25-32mm. Secure and easy mounting with 4 srews. Especially designed for combination with bags that have the rackpack coupling at the bottom. Includes rear-side plate for reflector or backlight. 10kg maximum load.
This product is equipped with a fix-mounting solution for bikers who want to leave their basket, bag or box or permanently mounted on their bike, without quick release function.