Sails are expensive. Why not protect them with a durable water-repellent sail bag. We make these bags with your choice of sunbrella fabric. They are durable and will last for years. They have a drawstring closure at the top.
These bags are also great for many other purposes on the boat; carrying your gear, packing your clothes for an overnight cruise.

They come in four sizes:

12" x 20" - Small
18" x 24" - Medium
18" x 30" - Large
24" x 36" - X Large