【WATER SAVING】The 20 Gallon Slow Release Irrigation bags,100% clean water concentration,delivers water directly from small holes of the bottom to the roots of trees without wasting water due to run-off and evaporation.Great for newly planted trees with a trunk of less than 4-inches in diameter. Helps reduce transplant shock and drought stress,save at least 30% on your water bill. 【HEAVY DUTY MATERIAL】Our Tree Watering Bags are made of PVC material with zipper,they are durable and easy to clean.They can be easily transferred from one tree to the next.You can zip the tree watering bags off the trees and store them in dry place.Please drain residual water left in winter as freezing could cause bags damaged. 【LARGE CAPACITY】Our Irrigation Bag can hold up to 20 gallons of water each,it is a slow drip irrigation system that will release water for 2”to 8”diameter trunk for 5-8 hours,time also depends on the weather.The zipper can also zip two bags together to double the capacity for thicker trunks,for example,2 bags together fit 6”-16”diameter trunk. However,really young sapling (within 2”in diameter)may be too small to use this tree watering bag.