The older Ursacks did have their problems. The newer S29 version that was approved last year certainly stood up to extra grizzly bear testing (it was even left in the pen with the "testers" for an extra hour). Of course, despite being approved by the Grizzly Bear people, it has not been approved by the national parks in the Sierra and probably never will be. It's thus moot for those who backpack in the Sierra. IMHO, Sierra bears are definitely smarter than your average bear! But I'd certainly take it instead of my Bearikade (which is NOT IGBC approved, although it is approved for the Sierra) to grizzly bear country.

I bought an S29 last fall (with a 20% off coupon from REI), and it's definitely stouter than the old ones.