Shop › Flag Base Water Bag Image 1 of 1 Flag Base Water Bag $16.00 Designed for use with flag 15' Flag or UNDERBallast Type: WaterBallast Volume: Holds approximately 2.75 Gallons Quantity: Add To Cart Added! Designed for use with flag 15' Flag or UNDERBallast Type: WaterBallast Volume: Holds approximately 2.75 Gallons