The M4 MY4SONS 4-Gallon Battery-Powered Backpack Sprayer is ... to run out of product while spraying, the best garden sprayer would be one with a bigger capacity. However, if your concern is ...

Battery-powered backpack sprayers have a constant PSI ... and pesticides where necessary. The 4-gallon tank has a two-step filtration system, one at the top and another at the shut-off valve.