Bear Can Suction

balzaccom

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Joined
Sep 30, 2014
Messages
537
On our recent trip to Mono Pass and Pioneer Basin, we had something happen that really took us by surprise. No, it wasn't the hailstorm that clobbered us right at dusk--although we had hoped we would miss that particular adventure. But it's related to that.

The next morning, when we got up and inspected the damage around our campsite from the hailstorm, we were surprised to see about a half an inch of water sloshing around inside our Bearvault.
Huh? The bear can was sitting away from our tent, in a small clearing among some trees, and it was upright the entire time---from before the storm hit to the next morning. So how did all that water get into the can?
All we can imagine is that the small lip on the bear can that sticks out beyond the lid was saturated during the rain and hailstorm, and that the can and its contents were relatively warm from the day's hike. As the contents cooled, they must have created a bit of a vacuum, and if the lip were saturated with water, maybe the vacuum sucked the water standing on the lip up through the threads and into the can. And that continued for some time, because the storm lasted a while, and the really cooled down everything--there was still an inch of hail on the ground when we woke up the next morning.
Anybody got a better explanation?
 

Nick

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Joined
Aug 9, 2007
Messages
12,938
That's easy. A bear opened it during rain storm. He must have looked around and decided he didn't like any of your food. Bear then neatly closed the canister up and put it back where he found it.
 

balzaccom

Member
Joined
Sep 30, 2014
Messages
537
That's easy. A bear opened it during rain storm. He must have looked around and decided he didn't like any of your food. Bear then neatly closed the canister up and put it back where he found it.
Excellent!

Now why did the bear like all that nice food we brought? hmmmm.
 

balzaccom

Member
Joined
Sep 30, 2014
Messages
537
Sarah at BearVault was kind enough to respond to our recent questions about water getting into the BearVault during a storm. Here's what she wrote:
"There is a small lip on the BearVault housing which prevents a bear’s claw or tooth from getting under the lid during an attack. If the BearVault is almost perfectly upright then during a rain this lip can allow a small “moat” of water to form at the top of the housing. If the storm then passes during the night, the atmospheric pressure gets higher and this forces the water in the “moat” up the threads and into the housing.
To prevent this, just tilt the unit slightly during the night so that the water cannot accumulate in that “moat” if it rains- it’s that simple."
 
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