The Vevor pool cover water bags set includes five 10-foot double-chamber tubes designed to help secure inground pool covers during winter. Made from thick 0.4 mm PVC, these bags are built to resist UV exposure, minor impacts, and seasonal temperature changes. High-frequency welded seams and leak-proof twist caps help provide reliable sealing and long-lasting performance. The dual-chamber design improves stability and helps prevent rolling or shifting in wind. These water bags are easy to fill, drain, and store for seasonal use.