This is one of the best waterproof line concepts. It offers excellent insulation against the elements. You will need a butter knife or similar to open them before use. 2 stars for the fact that the clasps/locks are plastic. This is my third season of using them and two thirds of them are broken. I still decided to buy more because they work well, but be careful - buy twice as much as you need. I even had a break the first time I used it.