The ATC article says "approved bear resistant storage container", and it gives a local USFS phone number to call for more information if you are confused about what would be an "approved" container. If you don't want to make a phone call, you can spend about two minutes searching on the internet and find the actual order on the Chattahoochee National Forest website. Or you could tell the ranger, as he writes you a ticket, "I thought an odor bag was good enough".