Next camp out. Seriously, why store it when you camp that often??
I’ve $1,000+ invested in sleeping bags for my family, as we try to camp a lot, and they suck to store.
Pay $15-20 at Wally World, go on your camp and then give the bag away.
Buy another one if/when you camp again.
If you want to get into camping, buy a Wiggy’s and never look back (it was a CBer that sold me on them and they are game changing.). They also set you back $200-400.