Get the 20 gal. Water Bag for slow - release drip irrigation for trees Ideal for both newly planted and established trees, it's a game - changer for tree care. Made of heavy - duty, weather - resistant PVC, it features a durable nylon zipper and well - sewn seams. With a 20 gal. capacity, it releases water slowly through 2 holes at the bottom corners, allowing for deep penetration without evaporation. The water release time is about 5 to 9 hours, though it can vary from 5 to 24 hours depending on conditions. Setting it up is a breeze: put it on the tree like a jacket, zip it up, fill it to 1/4, lift the top straps to expand the bottom, and then fill the rest. This bag saves you time and water, preventing runoff and ensuring your trees get the deep watering they need, especially during long, hot days.