I normally just leave my food in a plastic bag just by the fire for a night, and never had a problem so far.
Generally I do not think it's the brightest idea though, besides I am appreciating the ease of leaving the plastic can and being sure no critters (mice too) will steal the food from me.

On one hand, I don't want to add 2 pounds to my weight. On another - if I could eliminate my pot (replace it with the lid), and could use the canister itself as a chair...

The Ursack, on the other hand, is not adding any weight to my pack, but it's not really giving me that nice hard shell of convenience.

So, I'm really on the fence between these 2 guys.