One of the more frequent questions I hear is where to find a good deal on sandbags. I usually buy mine from eBay. Bags come in two main sizes, 14″ x 26″ and 18″ x 30″. We always use the smaller bags which weigh about 40 to 50 lbs each when full and make a wall about a foot thick when plastered. We buy 1000 bags at a time so you get a better bulk buying discount.