Well, color me skeptical.

I'm a bear canister convert. I tried to buy an ursack and the store owner absolutely refused to do it. He was sick of refunding people who brought them back from the Sierra all torn up.

Seen too many trip reports with pictures of the bottoms torn out of the things. I do not believe there will ever be a bag capable of withstanding a habituated black bear - if they can get teeth into it, they will work it until it's done. A Yosemite ranger told me about the time he had to hike bolt cutters into the wilderness to cut the ropes after a bear tore an ursack in two - the bear worked it alllllllll night and the knots were so tight the hiker couldn't get the bag remnant off the tree.

I do not care if they are ever approved anywhere. I'll use the canister. Let the bears bother the ursack users. I will be asleep, not listening to the bears get my food.
_________________________
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki

http://hikeandbackpack.com