The fleece socks on the raptor and chief style side quivers will mash those feathers flat!
If you have a side quiver, a simple foam plug with notches will hold the feathers seperate like in a bow quiver. I forgot to add the how lol, in case you're scratching your melon over this, shove the plug in the open end of the chief or simliar quiver. The notches are along the outer edge of plug. I dont use mine for roving/small game opting out for a backquiver.
Rain and stain if you can find it works. (payless)
As does baby bottle liners. If you're stalking flip them around so the bottom of th eliner is on the leading edge of the feather, works good. You can add a rubber band if needed.