We were able to test our smell proof Heavy Duty Bags with real bears, and here were the results.*
Watch How Smelly Proof Bags Evade Bears!
We put food in a Heavy Duty Smelly Proof bag and hid it along with other food. The bears would find food under rocks but would walk right past our food in our bags.
*Bags must have no food or humans smells on outside of bag. Smelly Proof bags should be used in conjunction with a bear canister or hanging a bear bag depending on the rules for the area you are in.