Premium Material: This portable backpack is made of thick PVC material, it is not easy to fade or deform, durable and can be used for a long time. Sturdy and Reliable: The base counterweight of this umbrella weighted bag can provide additional weight to improve the stability of the umbrella. You don't need to nail heavy objects to the ground. Effortless Installation: Simply fill it with water (it can hold up to 7 kg) and place it directly under your outdoor flag, whether it's a knife flag or a beach flag. Compatibility with Flag Poles: Designed to work seamlessly with flag poles and stands, making it a versatile choice. Versatile Use: Our umbrella base weight bag is ideal for flag poles and flying swing stands and offers flexibility for different occasions. Note: The data are all measured manually, please allow 1-3 cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.