2 Gallon Black Genuine Root Pouch 4 to 5 Year Grow Bag (Bundle of 25) Air Pruning Of Roots Boosts plant growth and yields Fabric allows roots to breath, Prevents roots from circling Pots are washable and last for multiple seasons Keeps plants warmer in winter & cooler in summer, Pots allow plants to be placed outside quicker Can be used with drip systems, overheads & hydroponic flood trays,Rain Gutter Grow Systems