The Smith Multi-Use 4 Gallon "No Leak" internal pump backpack is designed with safety and comfort in mind. The internal pump technology eliminates chemicals dripping down the user's back. With premium components throughout, including a thick, adjustable harness with padded straps and chest strap, this sprayer is the workhorse that will get the job done. Fountainhead Group Smith Mulyi-Use 4 Gallon No-Leak Backpack Sprayer 190670