I bought a couple of these from Home Depot, they work great. One bag fits in each and I can use one of those large square scoops, it's a pain in the butt when the bin is topped off though. I kept them stacked in the corner of the barn with my supplement drawer on top. One was for senior feed, one was for safe choice. When they get close to empty, just take the lid off and dump them into the pan or scoop.

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http://www.homedepot.com/p/HDX-18-gal-Hopper-Bin-BH188810T/100669782#.UouGX9hINT0
Here's how I set it up early on. I could use the top to mix grain.
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Before that, I kept bags of grain in wooden tack boxes, and crap on top. Wasn't very nice because I had to dig the grain out every day.
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Last Edited By: AmandaandTuff Nov 19 13 7:48 AM. Edited 1 times.