The Plastic Tray is a great option if you are not going to use the functional cardboard box. The tray is designed to accommodate the Fresh Patch Mini grass pad (16" x 12"). The grass is easily removed from the cardboard box and inserted in the plastic tray.
The tray is helpful if:
1. Your dog chews on the cardboard box
2. Your Fresh Patch is being used outdoors in rain or snow
3. Your dog needs a lower profile for entrance into the unit