Gravipod 18" Square Umbrella Base Weight Bag — 18" fit, holds up to 110 lb, weather‑resistant ballistic fabric

The Gravipod 18" Square Umbrella Base Weight Bag is a heavy-duty, no-lift sand-fill weight designed to secure most patio and cantilever umbrellas with up to 110 pounds of ballast.

Made from ballistic rip-stop polyester with reinforced seams and a large top opening, this low-profile weight bag slips over 18" square bases and fills on-site so you don’t need to lift heavy blocks. The tear-resistant, weather-ready construction and integrated carry handles make it portable, durable, and simple to use for patios, decks, events, or rental setups.

How does this weight bag improve umbrella stability?

The Gravipod bag increases the effective ballast on your umbrella base to reduce tipping and movement in wind or high-traffic areas. By adding up to 110 lb of sand, it lowers the center of gravity and distributes weight across the base for steady performance.

• Holds up to 110 pounds of sand for dependable anchoring.
• Fits square 18" profiles common to offset and cantilever bases.
• Reinforced stitching keeps seams secure under load.

Is it easy to fill, move, and store?

Yes — the large top opening and heavy-duty Velcro closure let you fill the bag on the spot without lifting heavy blocks. When empty, it folds flat to save storage space and the built-in handles allow quick repositioning or transport.

• Wide fill mouth for no-lift sand or gravel filling.
• Integrated carry handles for maneuvering once filled or empty.
• Folds flat for compact off-season storage or transport.

Will the bag withstand weather and outdoor use?

The outer shell is crafted from weather-resistant ballistic rip-stop polyester to resist tearing, fading, and exposure to sun and rain. Reinforced seams and durable materials help the bag last through repeated seasonal use without leaking or shredding.

• Ballistic rip-stop polyester resists UV damage and abrasion.
• Reinforced seams prevent separation under heavy load.
• Designed to remain leak- and tear-resistant during outdoor use.

Which umbrella types and setups is this compatible with?

The Gravipod fits most 18" square umbrella bases including offset, cantilever, and many patio-style stands, offering a low-profile solution that won’t interfere with umbrella operation or patio layout. It’s ideal where you prefer on-site filling and removal over heavy permanent weights.

• Compatible with most 18" square bases used on cantilever and offset umbrellas.
• Works well with rental, residential, and event umbrellas where temporary ballast is needed.
• Doesn’t obstruct umbrella tilt or rotation when properly installed.

Who is this for? The Gravipod 18" Square Umbrella Base Weight Bag is aimed at homeowners, event planners, rental companies, and hospitality operators who need a portable, durable, and weather-resistant ballast solution. If you want simple on-site filling, strong wind resistance up to 110 lb of ballast, and a low-profile, reusable alternative to concrete blocks, this bag is a practical choice for stabilizing patio, cantilever, or offset umbrellas.