All of the shelters along the Appalachian Trail in the Great Smoky Mountains National Park used to have chain link fences across the front. The idea being that you would take your food into the shelter with you and close the fence behind you to keep the bears out. But they found two things, 1) mice are a huge issue, and 2) the bears associated the shelters and humans with food smells (and morons were feeding the bears through the fence).
So about 15+ years ago they started to take out the fences and renovate the shelters. Now they have a cable pulley system attached to some trees at all the shelters and campsites in the GSMNP for you to hoist your stinky stuff, and most of the shelters no longer have a fence.
As for bears, i have read that they can be a nuisance, but I have hiked 1000+ miles in the GSMNP (almost all backpacking miles) and have only seen 2 bears on the trails and have never been harassed by them at camp. I'm far more concerned about mice getting my snickers.
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