Gravipod 18" Round Umbrella Base Weight Bag - Up to 85#. Safety solution for Patio, Offset and Cantilever Umbrellas. Heavy Duty Ballistic Polyester with XL opening. Weather and UV resistant The Original Umbrella Weight Bag! 18" Round design - simple and convenient - Just add your own sand* Designed for 3.0" umbrella bases, but can accommodate base sizes of up to 3.5" easily Rugged and durable Ballistic Rip Stop polyester with PVC lining and triple stitch-locked seams. Adds up to 85 lbs of ballast to your existing umbrella stand, based on amount of sand added Soft and easy on the toes, no hard edges to kick. No rust, dings or dents. <span class="a-text-bold">Gravipod</span> GP-18Ris designed to fit over your offset, cantilevered or standard patio umbrella stand and provides 85 pounds of stabilizing force. <span class="a-text-bold">Easy-Fill System</span> makes it simple to fill with sand in place, so no heavy lifting. <span class="a-text-bold">Quality</span>, durable construction with industry leading components, means no leaking, no tears, and product longevity <span class="a-text-bold">The Original Umbrella Weight</span> has been refined and improved over the years to create the perfect balance of workmanship and performance. <span class="a-text-bold">American ingenuity </span>in design, sales, and support. <span class="a-text-bold">No Hassles.</span> If you&#039;re not happy, we&#039;re not happy <span class="a-text-bold">Portable Gravity</span> - Holding your stuff to the planet, Period! Place on Stand Fill with Sand Add your Umbrella Industrial Ballistic Rip-Stop Polyester fabric with 5/8 inch weave. Top of the line industrial grade fabric. Highest Quality 2&#034; Velcro to prevent messy leakage or spillage, even with multiple fillings. Grade A means it is the strongest, most durable velcro on the market. Triple-stitched 606 Heavy Duty Polyester thread sewn on all seams. The highest tensile strength available for sewing production. Internal water resistant PVC membrane which keeps moisture out and sand inside the product. This critical, full additional layer of protection, does not degrade.