Garden Armor 20 Gallon Slow-Release Tree Watering Bag 100% water concentration, conserves water by preventing run-off Holds up to 20 gallons and wraps trunk sizes of 4". Can expand with multiple bags Made with commercial grade UV stabilized coated polyethylene Heavy duty locking zipper keeps bag from shifting Releases water over a 5-8 hour period allowing for a deep saturation 100% water concentration, conserves water by preventing run-off Holds up to 20 gallons and wraps trunk sizes of 4&#034;. Can expand with multiple bags Made with commercial grade UV stabilized coated polyethylene Heavy duty locking zipper keeps bag from shifting Releases water over a 5-8 hour period allowing for a deep saturation