We had the same problem. The little buggers ate the suit, the seed, and all in about 20 minutes. Poor little birds didnt get anything. Then we discovered PVC pipe. We took the feeder off the pole, slid the pipe over the pole and put the feeder back. The squirrels cant climb the pole at all... they try... but they just slide down. It's a riot to see them go around and around the pole trying to figure out how to get to the goodies...
I will run out and take a pic with my phone so you can see what it looks like. Granted it's not beautiful, but it really does work! After you try all the bags and other stuff... spend the 14 to 20$ and never have to worrie about it again.