The ergonomic design of the Ryobi Backpack Paint Sprayer, which stores 11/2 gallons of paint, fits comfortably on one's back. Its Fluid Technology continually mixes and circulates the paint for optimum consistency and flow, virtually eliminating clogging or splattering. Other features include: reversible pump for easy cleaning, three-pattern spray nozzle, variable-flow dial on applicator wand to control painting speed, and ergonomic handle for maximum user comfort. Comes with sprayer and roller attachments, two 18-V lithium batteries, and battery charger.