I designed this bracket to hold my snap-on toolbag off the side of my rollcab. It holds over 20KG of weight with absolutely no issues. This is a snap-on/Bluepoint branded rollcab. Obviously it won't fit other makes unless you have the same handle fitted to your rollcab.

Print both pieces and glue together. Originally I printed in PLA as a test piece, however the PLA held up just fine and I've no reason to re-print in PETG.