Rope bags are many things but they are not waterproof. All the fabrics they're made of are permeable. So you better check the weather before you leave the house. If you are looking for a waterproof product, we recommend the waterproof bags that are used a lot in the nautical world. Otherwise, if what you want is a drawstring backpack at all costs, the best option is to get another one of those great products as a complement to the backpacks: the waterproof cover with elastic to fit the drawstring backpack you are going to carry.