Every year, a farmer near me makes a very long hayrack by knocking in fence poles in two parallel lines, and then fastening stock netting between them in a sort of hammock. I think he does two layers, overlapping, to reduce the size of the holes.
It's quite high off the ground - sheep head height - no lid, but keeps the hay from being trampled.
Seems successful as he repeats it each year, and I suppose the materials are reusable for a fence, or next year's hayrack.