This is a little ledge mounted to the side of the bicycle luggage rack to rest a parcel on.
The parcel then is strapped to the bicycle with a lashing strap.
Prevents the parcel from sliding down while being strapped to the side.

Mounted with a M5 Screw (rust free) of about 40mm.
Swivel to side and turn to adjust.
Diameter of luggage rack bars is 10mm round.

Can be adjusted as needed as SCAD file is there.
Needs MCAD/boxes.scad
Print settings dont matter.

Warning: Do not make too big or swivel inwards too much so it may interfere with spokes