I suppose this one is better named the hanging carrier, since you can use it for more than bird feeding. For example, this one hangs from my towel bar in the shower:

The hole in the top holds my razor or toothbrush, and the bottom part holds soap safely out of the way so it can dry away from standing water (I poked drainage holes in the bottom with a pushpin and the punch.)

To make the hanging carrier into a bird feeder, you simply add a bottom platform for the birds to stand on and perhaps some weight hanging from the center for balance. I made mine with several large tubes, but I suppose a single one would do:

Obviously, you'll hang a weight from the bottom (like a rock tied to a string) so that the birds don't tip it too much during use.