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And just FYI...RMNP requires canisters.
From NPS.gov "Bear canisters are required at all backcountry campsites below treeline. "
I have never stayed beneath tree line and this rule appears to be recent. That said, I agree with the points expressed above completely. It is up to us to keep bears away from the food. I always use an Ursack but have never had it tested. Nice thing about it is that is doesn't bounce around and roll down hills if a bear gets a hold of it.
They have some cool videos on their site. In no way am I affiliated with these guys just a happy user both here in the Colorado high country and in the Sierras.