I guess what I should have said was that the OP Sacks definitely did keep my dog from getting into his pack after his food. Whether they would have kept trained drug-sniffing dogs or bears away is problematic, especially in view of the BPL article mentioned.

Urscack does recommend using OP Sacks inside the bag so there is less odor wafting out to the neighborhood.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey