Snow2Winter Heavy Duty 22 Gauge Water Bag Kit (Various Pool Sizes) (18 x 36 Ft. Rect.) Heavy Duty 22 Gauge Water Bag Kits are assembled with double chamber water bags. Water bags are the best way to keep your pool cover secure all winter long. These water bags are manufactured from quality heavy gauge vinyl which has been treated with UV inhibitors as well as antibacterial and anti-fungal additives. They are designed to withstand sub-zero temperatures, keeping your pool cover secure all winter long. These kits are made up of combinations of 8' and 10' water bags. This 18 x 36 Ft. kit includes (2) 8 Ft. and (10) 10 Ft. water bags.