Gravipod 14"x14" Square Umbrella Base Weight Bag - Up to 65#. Safety solution for Patio, Offset and Cantilever Umbrellas. Heavy Duty Ballistic Polyester. Weather/UV resistant New! 14" Square design - simple and convenient - Just add your own sand* Designed for 1.75"-2.0" umbrella bases, but can acommodate base sizes of up to 3.0" easily Rugged and durable Ballistic Rip-stop polyester with PVC lining and triple stitch-locked seams. Adds up to 65 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.