With a pump sack, you can easily inflate your sleeping pad with just a few pumps. This way, you avoid blowing it up with your mouth and thereby prevent moisture from getting inside the sleeping pad. Many pump sacks can also be used as a stuff sack when needed, and when not in use, they take up very little space in your pack. Choose pump sacks from brands such as Urberg, Therm-a-rest, and Sydvang.