Features: 1. Sturdy and reliable: With the help of the basic counterweight of this umbrella, additional weight can be provided to improve the stability of the umbrella under strong winds, storms and other high wind conditions. You dont have to nail any heavy objects on the ground, save your time to lift heavy objects or sandbags, and enjoy more safety. 2. Versatile and easy to store: 5.5cm flagpole socket, strong versatility, suitable for flagpoles below 5.5cm in diameter; it can be folded and placed in a small space in winter or when not in use. 3. Water or sand filling: the small umbrella bottom water weight bag can fill up to 5kg-6kg; the large umbrella bottom water weight bag can fill up to 9kg-10kg, and it can also be filled with sand 4. Water inlet: expand the water inlet, easy to fill, open the faucet, and directly connect the water to the water bag of various sizes, which is convenient to use; specially designed for all outdoor umbrellas, keep your outdoor umbrella in a proper position. 5. Multifunctional: Multi-purpose and practical water bag, which can be filled with water, filled with sand or inflated. After inflating, it can be used as a portable seat cushion, camping pillow or back cushion. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Material: PVC Size: S: 29*29*5cm, the diameter of the nozzle is 1.3cm, the diameter of the socket is 5.5cm; water can be injected 5kg-6kg L: 32*32*8cm, the diameter of the nozzle is 2.5cm, the diameter of the socket is 5.5cm; water can be injected 9kg-10kg Package List: 1 X Umbrella Base