Originally Posted by dh024

I have an Ursack and love it. I will never use a hard canister again. The Ursack slips into a pannier so easily and it's far lighter. It is best to hang them, but not necessary if you can tie it off to something secure, like a tree. And rumours of bears carrying them off or crushing all the food inside are just that - rumours. Real tests by real bears have proved that these bags work. Interestingly, it looks like they might actually be more bear-resistant than traditional hard-sided bear canisters, especially after recent reports coming out of Yosemite where bears have smashed dozens of hard sided canisters.

And no, bears can't untie knots. (I think that comment above was meant to be humorous... I think.)