I am planning to go hiking this weekend with a few other people. On a past hike, we had a guide and he showed us how to "bear bag" our food. Sadly, we forgot the procedure and are in need of instruction. The supplies that we used were: a few (2-3) carabieners and a long rope (or two).....i am not really sure if the supplies are correct so please help me out and we REALLY need to know the procedure because we don't want to be attacked by bears (and the mountain we are hiking on is named "Bear Mountain", so yes there is a lot of bears there), thanks

Make sure the bag is 12 feet off the ground and 10 feet away from the trunk of the tree.

First off.... Find a tree away from camp!

I have a few food bags, but the simplest one is a large rip stop nylon stuff sack with a heavy plastic liner.
I keep 150 feet of para cord in the bag. Along with that are two carabiners and a smaller stuff sack (sock sized).

I find a rock that fits in the small bag. Pick the right branch, one that is about twenty feet off the ground and sticks out far enough that you can hang the bag about twelve feet from the trunk.
Carefully (so it doesn't come back and hit you in the head) throw the rock/bag that is now attached to your para cord over the branch. Once you get the hang of it you'll nail it pretty fast. The rock/bag will come back down to your feet when you give it slack.
Make sure your food bag is tied tightly at the top and attach the biner to the bag (mine has a strap for the biner, if you don't, just tie the para cord to the bag.)
Hoist the bag up about twelve feet off the ground, you might need a helper to push on the bag from below with a branch if the bag is too heavy.
You can then run the loose end of the para cord to the trunk of the tree or to another near by object and tie off.
I usually wrap the cord around the base of the tree a feww times, then use half hitches or a truckers hitch to tie it off.
find the tree and get the rope ready as you set up camp. hang the food bag when ever you leave camp. don't forget to put your toiletries in there at night before you do your final hoist of the food bag at night.
I have camped in heavy bear country my whole life both black and grizzly. I have seen many bears and had them in the camp site. I have awoken to steamy piles of grizzly turds so close that I have freaked out, But I have always been very carefull about my food and have never (knock on wood) had troubles with loosing my food. Unfortunatly I have run into many campers who had to cut short their trips due to negligance. When a few people let down their gaurd and the bears get used to free food, it becomes all of our problem!

Just take hiking pre-packaged food, bears don't like it.