Great question — answering as the UphillTech team:
No, most likely not. These often leak liquids when turned upside down, so are not as tightly sealed as one might expect. If you take a human sense of smell as 1, a normal dog has a sense of smell that is about 100x better than human, and a dog bred for smell detection, such as a blood-hound, has a sense of smell about 3x better again (i.e. 300x better than human) It is estimated that bear sense of smell is about 7x as good as that of a bloodhound, or about 2100x better than human (WARNING - link is to a PDF). However, all the figures I could find were from the USA. There are a few species of bear in the USA, but at least one - the brown bear/grizzly, is the same species as in the brown bear...
Full answer by bob1: https://outdoors.stackexchange.com/a/30325 (CC BY-SA 4.0).
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