Heavy-Duty Sandbags These essential flood protection sandbags are made from durable polypropylene material, that make it Uv-resistant. A wide opening for easy filling with sand or gravel. Be prepared for heavy rainfall and easily create a strong defense barrier. Crafted with precision weaving and reinforced stitching, these heavy duty sandbags offer excellent tear resistance, with each bag capable of holding up to 50 lbs.