I "store" my hay, which I buy in bales, in largerectangular plastic bags I have. They are not sealed, so thecontentsdon't go moldy. The "bag" just serves tokeep the hay from falling all over my shed floor.
I've also used regular, large black trash bags, that tightly fit over abale of hay. I stood it up on end, and dispensed from theopen top. The rectangular bags I now usework wellon the castored shelving I built to hold my hay bale andstraw bale. They are becoming decrepid and "holey" with useand I will have to soon search on the internet for replacements.
My point is, simple plastic bags can serve to store your hay, in acloset if need be, as long as you don't seal it and permit it to getmoldy. I have six rabbits and go through one bale of hay andstraw each per year. That is with free feeding of hay yearround and straw bedding in the winter time for the hutchbound rabbits.
There is no need to spend excessive amounts of money on hay if you buyit by the bale, wherever horses and cattle arefound. On the other hand, spending a lot of moneyfor some things make some people feel better 'cause if it is expensive,it's got to be better, right?
Buck