Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have used bags from most sorts of produce, and they hang in there really well. Some are pretty stiff, so will not accommodate small spaces, but most will work just fine. Zip tie them together. You can rinse the media while it is still in that bag, too.
Nylon stockings work well for the finest media, and also hold up really well. I use rubber bands for media that needs to be replaced (peat moss). Rubber bands deteriorate. When they break, I know I should have replaced the media. Zip ties work great for permanent media.
Strawberry baskets might be another media tray type of thing. They are flimsy, but could be informally stacked.
There is a thread here that includes some small stacking drawers as media trays. The person drilled lots of holes in the lid and bottoms of all the drawers so the water passes through, but the holes are fine enough to contain the media.