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I have found that the best tray is a plastic 12-quart dish tray ($1 an Walmart) lined with foil on the inside. 12-quarts is a manageable tray size for multiple small trays so you don't break your back dealing with a single big tray. The foil lining is important because it allows the substrate to shrink, as it will after a high yield flush or two, and still keep the sides covered, preventing drying out and side pinning. For some reason the mycelium tends to bond to the foil, so it works surprisingly well. As one goes beyond the 100% biological efficiency mark after the first flush, the substrate shrinks from the sides of the container yet pulls the foil in with it, leaving an inch or two gap that, without the foil, would just dry out the entire substrate prematurely and reduce yield.
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