Forced-Air Vaporizers are designed to do one thing: Force air! Alright, you could have probably figured that out yourself. But these devices go hand-in-hand with another cool vaporizer feature: Balloon bags! Balloon bags are fantstic for groups as well as solo sessions. The vaporizer utilizes a fan to blow air through a heating element into an herb chamber. The heated air activates the herbs, passing the essential vapor into a clear polyester balloon. The vapor stays fresh for up to 10 hours in a standard 2-foot long bag.