Get your 12 - pack of 20 - gallon tree watering bags for efficient tree irrigation. These bags, made of tough, UV - resistant PVC tarpaulin, are built to last. With a large capacity of 20 gal., water is released slowly over 5 to 24 hours, depending on soil type, weather, and tree size. Installation is a breeze: just wrap around the tree, zip up, and fill. The wide 3 - inch opening allows for quick filling in 2 - 5 minutes with a standard garden hose. They're perfect for new and established trees, especially in drought - prone or hot areas. Follow the guideline of 10 gal. per week per 1 - inch trunk diameter easily. For larger trees, zip 2 bags together. Save on labor costs and water, and promote healthy root development with these practical tree watering solutions. Material: Plastic.