Field King 190328 Backpack Sprayer (4 Gallon)

Once you commit to a real liquid program — a pre-overseeding weed knockdown across the whole yard, or a season of liquid feeding and bio-stimulants — a one-gallon handheld sprayer becomes a bottleneck. The Field King 190328 is the backpack we recommend stepping up to. Its four-gallon tank covers a typical lawn in one or two fills instead of eight, and the standout feature is the internal pump: unlike cheaper external-pump backpacks that leak chemical down your back over time, Field King's pump lives inside the tank, so the seals are chemical-rated and it stays dry. It builds up to 150 PSI for a genuine fan or cone pattern, which matters for even herbicide coverage — patchy spraying means surviving weeds. Padded straps make a full four gallons carryable, and it comes with multiple nozzles for everything from a wide weed-control fan to a targeted stream. It costs more than a pump sprayer and is more than a small lawn needs, but for anyone treating the whole lawn ahead of a fall overseeding, the even coverage and no-leak comfort are worth every dollar.