I have one that is very similar but it is the leather material. The leather is less likely to leave scratches than the Cordura type. That said with it mounted up there and with wind force, expect to get some scratching on the trees, normall very light and easy to get out.
It needs to be secured very well to prevent constant movement from the wind. Also if it rides against the headlight bucket, expect some wear in the chrome there.
Overall it works good but if you are hyper about possible scratches, best to avoid. Sissy bar and bags would be best bet for least likely scratchinig.
Good luck