For extra security. These sandbags are really strong and versatile. Use them as outdoor furniture weights and to keep drying racks / trampolines steady: or as a doorstop Up to 22.2 kg. You can fill any umbrella sandbag with sand, gravel or stones (not water). to make a patio umbrella weight of 22 kg and keep a cantilever umbrella stand safe and in place. For any harsh weather. These outdoor umbrella weights are made from durable, water resistant, UV resistant, stain resistant material that can withstand extreme temperatures: all year round sand bags for stands. Will last for years Each beach umbrella sandbag is made of high-density 600D reinforced fabric that does not tear or stretch. No plastic layers, so no molding or vaping inside the umbrella weight bag. Smart and user-friendly design. Curved umbrella weights make a larger contact area. Carry the umbrella weights with the sturdy strap. Simply fill the sandbags through large openings at both ends with ultra-dense, dirt-free Velcro fasteners.