SINGLE UNIT, ONE SANDBAG. Stabilize your offset patio umbrellas cross base with this saddlebag style sand bag. Fill with between 44 lbs. and 55 lbs. of sand, gravel, even nuts and bolts to secure your umbrella safely from tipping over. Made of heavy duty 600D oxford and finished with zippered construction, this bag is the perfect solution to your umbrella cross base. We recommend using 2 bags. UMBRELLA BASE NOT INCLUDED. This item is shipped as one bag. By Trademark Innovations.