Another alternative would be something like this
http://www.lowes.com/lkn?action=prod...25989-362-3937 It can be purchased at most home improvement stores and probabaly places like Wal-mart and such. Hangs right on the grids and a couple of zip ties keeps it in place. This is what I use and works great. Holds enough hay for 2 piggies for one day if i pack it really full. Hope this helps.
catinhat72