Harvest Right Pro Medium Freezer Tray Lids - 5 lids for use with medium PRO freeze dryer trays. Lids snap directly onto trays.Specifications and Features: BPA free Non-stick trays can also divide food into sections Great for covering food and stacking trays in the freezer when pre-freezing food Perfect for saving space in your freezer Use these lids as trays when freeze drying. They work as well as the stainless steel trays. When used for freeze drying, the food doesn't stick to them. Great for things that are sticky. Don't need parchment paper or silicone inserts. When used as trays they are perfect for liquids as the liquids are less likely to slosh and spill over the sides.