I imagine they work in the lab.

I doubt they matter in the field. Bears are not sharks, and there's probably more food smell on my beard after dinner than what would come out of an (admittedly imperfect) ziploc freezer bag.

With properly stored (hung, canistered, ursack'ed) food I doubt they would matter. For improperly stored food, it ain't going to help. By the time the bear is close enough to smell the difference, they're going to be curious enough anyway to try it out if they can get at it.

Just my two cents. FWIW, my food is normally in an ursack these days, in sealed ziplocs. I put my (aluminum) pot lid on top to keep rodents out of the end hole. never lost food that way, and I have had a bear chew on it some once.(and run off I yelled at it). I normally keep my ursack tied as per the instructions to a tree.. that might be an option for you if you don't like the weight of a canister.