Thanks for all the advice, feedback is good. From what everybody is saying, bears seam to be very resourceful. Humans = food. In that situation, then nothing will stop them. Obviously, more research is needed, but a good experiment would be to find a location in the woods that has bear activity or other similar animal activity. Put food in bag, and leave it in the location for a week. If you come back, and the food is untouched, then that would show how effective it is in certain conditions. It may not be perfect, but at least it will help reduce your chances of hungry animals.

Also, cross contamination is another factor. To avoid cross contamination, a spray could be used on the outside of the bag to eliminate any additonal food odors.