Five gal buckets and ice chests both have some advantages, but don't consider them to be able to contain odors, or be bear proof. A black bear can open one easily, so just think what a brown could do. In some locations (Yosemite and Sequoia NPs come immediately to mind), the bears there are well known for being able to read words like Coleman and Igloo on ice chests, and know that a treat is inside. They will also rip the door off of your car to get at the ice chest. If you really worry about odors, I would vacuum seal all of my food, and never ever eat in my vehicle, or go thru a drive-thru at McD's, for sure you will drop a fry on the floor, and its odor will remain for a long time...