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.
I use an UrSack in areas that don't have a lot of history of bear problems. I've had good luck with mine, but I've only had a bear make a try at it once. I heard him right away and started shouting and making noise. The bear ran away, and my food was unharmed. I don't think my experience wouldn't work with a habituated bear.
I have two UrSacks, a pretty old pale yellow one ("cornsilk?") made from Vectran and a newer green one which I believe is made from Spectra. They may be both so old now as to be useless, but I continue to use the green one in low threat areas in Southern California.
HJ
