8 Pack of 5 Inch Plastic Nursery Pots AND Carrying Tray Insert. Designed specifically with flower and vegetable gardeners in mind, these 5-inch seedling pots and stability inserts are the perfect way to start off your garden this year on the right foot. The 5-inch square pot is the perfect size for starting seeds for indoor growing or potting up tender seedlings. The pots and inserts are made to fit perfectly in a 10x20 tray (not included). This insert hugs the seed-starting pots and prevents them from tipping over. The pots and carrying inserts are heavy-duty enough to be cleaned and used for multiple years. Keep your pots upright with this combination kit.