According to the website, these OP (Odor Proof) bags are great to keep Bears away from the campsite.
So, Can I just carry my food and other delicious smelling items in the light weight OP Bag and not fuss around with a Heavy Bear-Proof Canister?
Sounds good to me.

Website says:
http://www.basegear.com/op-sak-odor-proof-bag.htmlFeaturesGreat for preventing campsite animal instrusions.
Bags meet FDA and USDA specification for food contact.
Store tobacco products, use as a cigar humidor, or for freezing food.
A special non-permeable film is used to make these unique storage bags. Designed for hazardous materials and biological waste.
Place your toiletries and food into the O.P. SAK to prevent
bears from visiting your campsite.
These bags have been proven odor proof, humidity proof, vapor proof and certified 100% leakproof to 200 feet under water.
Also makes excellent pilot and hunter urinals or human waste containers.