George,
Thanks for sharing your observations concerning the UrSack.
While I continue to hope that UrSack will improve, I can see that they're probably not as "solid" as a bear canister.
HJ
I concur with HJ and George that a "solid" bear canister (Garcia, BV, Bearikade) is the most secure solution, it's obvious. These models should be highly encouraged for active bear areas, especially where there aren't any bear boxes. And these are the ones to rent to newbies and people without the skills of a typical ultralight backpacker. But let's also be honest about the Ursack. There's an aluminum liner that fits inside the bullet proof fabric that makes it very similar to a "solid" canister. The fabrics and stitching have continually improved. Give it some fair testing and allow technology to advance in a fair marketplace.
This is one reason why I'm headed to the Emigrant Wilderness next week instead of fighting for an Inyo permit. Thank you Stanislaus NF, no trailhead quotas, bear canisters "recommended" (I'm using my Ursack), and we can even have a campfire to cook our trout. Yeah, the real freedom of wilderness.