Make an impression with the Water Bag For X-Bases: Feather, Teardrop, Falcon, Mamba, a professional option for any booth or event space. This water-fillable bag sits on top of an X-base to add extra ballast in light wind, compatible with Feather, Teardrop, Falcon, and Mamba flag systems. Filled, it holds roughly 3 gallons of water (about 24 lbs), measures approximately 22 inches across on the outside with a 4.25-inch center hole, and sits about 4 inches tall once filled. It's the kind of display piece that earns its keep across many shows, not just one.