Abstract: A backpack sprayer is disclosed for dispensing different fluids. The backpack sprayer includes a housing with a bottom face and a dispensing assembly. The housing defines a fluid container, a battery compartment for receiving a battery, and a chamber for receiving a control assembly and a pump assembly. The dispensing assembly can dispense fluid from the fluid container. The pump assembly is configured to pump the fluid from the fluid container to the dispensing assembly. The control assembly is configured to control the pump assembly. The battery compartment is positioned above the bottom face with a first height therebetween, and the control assembly is positioned above the bottom face with a second height therebetween. The control assembly includes a rotatable dial, and the rotatable dial has a coupler for coupling a rotatory movement and a cam surface engaged by a follower for controlling on and off of the pump assembly.