+1 for good down. Treated the outside of my western mountaineering with NikWax solar guard and it helps slow down getting the down wet. I always sleep with a liner so I can just wash that. I keep our down bags layed flat under beds instead of the large bags.
Used the MTM case and the. Added 1/2” foam to the lid to help keep them in place for travel and as the other foam wears out.
Really like that Iron Will case, may be time to treat myself :)