Following.....
I've been curious about this subject for a while now.
We use 55 gallon plastic barrels to store our feed and it works great. But I get feed once a week and go through 100 lbs give or take per day. It would be great to get a months supply at a time and have it delivered.
For that much feed you should look into http://www.farmandranchdepot.com/farm-equipment/Mini_Bins/
JT