I've been getting hay from Small Pet Select and storing a portion of it in a sealed plastic container. The plastic container just makes it easier to access on a daily basis but does it need more airflow? I haven't noticed any getting moldy.
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I also store my hay in a large Sterilite container but I leave the lid off. I believe hay does need to breathe. I also picked up a tip from a member here regarding storing extra hay, I put it in a large Home Depot Lawn & Refuse bag and cover it with a sheet. It allows the hay to breathe and still protects it from anything getting into it.
I buy hay by the box. If it comes with a plastic liner inside the box, I take it out, remove the liner, and dump it back in the box, then poke a lot of holes it. Most hay sellers will tell you not to store it in airtight containers.
Hope this helps!
A lot will also depend on how old the hay is from the time it was cut. Hay - being an organic product - will emit gasses for a good 3-5 months after it has been cut and baled, before it is fully cured and "dried down".
As a large volume hay grower, we keep all of our hay in well ventilated buildings so it has constant airflow over all sides of the bales once it has been harvested
The absolute WORST thing you can do with hay is to stuff it into a plastic bag after its been baled, seal it up and have just those piddly little round holes in the bag, stuff all of those bags into a cardboard master carton and then store it on a shelf in the dark, exposed to heat/cold cycles. Emitting gasses all the time as it is curing. Its the perfect formula for mold to form in the bags as all of this is occurring
Storing it in a plastic bin is possible to do - just make sure you leave the lid "askew" so some air gets inside, keep it up off the ground on a skid otherwise as it is emitting gasses at the bottom, if the bin is flush against the floor, you will also trap moisture at the bottom and the mold process will start
Always open that bag and smell your hay. if it smells at all moldy or musty or "earthy" - dont feed it. Take it back and insist on a new bag. Ruffle the hay uip - does a microscopic dust come off the hay at all? Does it smell acrid? If so - seal it up and get it out of the house and back to the store
Hope this helps!