The PakAlarm is an affordable and reliable way to bear proof your camp. Basically it allows you to run a tough monofilament line around your tent which, if tripped, sets off a very loud siren. I’ve used it on two arctic and subarctic trips so far and wouldn’t go north without it again.
Here it is in action on the Seal River in Northern Manitoba on a day when we saw both polar bear and grizzly prints within a few kilometers of camp.