Kenley Tree Watering Bag - Slow Release Root Waterer System - Planting Water Bags for Trees 16.5 Gallon Original slow release watering bag by Kenley Fills in minutes and delivers water to tree roots over 6-7 hours Heavy duty zippers and reinforced stitching for maximum durability Ideal for both newly planted and well-established trees Holds up to 16.5 gallons, suitable for tree trunks up to 4 inches