Gordy shows a link to helmet bags. The one listed as 8401 is probably the most universal. I have always used one and never had a problem, but thats only in 39 years in helicopters.
I know of nothing that gives ultimate protection and do remember seeing one of my skid lids as it passed me by on the freeway after falling off the back of my bike many years ago. it did pretty well, until it was hit by a truck. I didnt even stop....
Headsets are a different story and one bag that now holds all my survival toys is found here :
BrightLine Pilot Flight Bag - MyPilotStore.com
Price is competetive.
There are more of course.
Flight Bags from MyPilotStore.com - Your Pilot Supplies Store
If you find that "I cant do without it bag", please let us know before I retire .