Polypropylene Olive Drab Sandbag - 15 Pieces Rugged Sandbags: Sandbaggy 14" x 26" Sandbags - will get your job done! Quality UV Inhibitors: Quality UV inhibitors are added during the manufacturing process, allowing the sandbag can last 3-6 months under direct sunlight. Caution: Be extremely careful of other sandbag sellers that claim their sandbags have UV protection but start to degrade after a couple of weeks. Read their reviews! We use virgin polypropylene resin to make our sandbags. Be careful of sandbags that use recycled resin that rupture easily due to their reduced tensile strength Sandbags Are Not Created Equal: Every manufacturer is different. Some cut corners by reducing the thickness of the bag and others do not add UV inhibitors.