How can I protect my bike against abrasion and scratches from bikepacking saddlebag straps?
It is mostly for a full frame bag, like the Apidura one.
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There are several things that I can imagine to achieve what you want.
You can get packs of frame protection tape such as this one:
Some bike shops also offer fitting this type of kit as a service, because its not an easy thing to make a good job of.