Rhino6 Packing Support file and Material Import problem

Hi, I’ve been using rhino6 recently. Everytime I save the file it keeps packing the textures?
Is there a way to turn this off? this gets slower and slower as I put in more materials.

Also I’ve realised when I worksession files into the main rhino file it brings in imported materials. So I just get a whole list of redundant duplications of materials. Also I cant purge them…
Any help appreciated!

Hello - do a SaveAs and un-check the setting for ‘Save textures’