Chapin 4-gallon Mixes on Exit (M.O.E.) Backpack Manual Backpack SprayerSpraying weeds around your fence line; applying liquid fertilizer throughout your yard; or protecting your flower garden from pests? We've taken our innovative Mixes on Exit (M. O. E.) technology and condensed to an easy to carry backpack! No more worrying about pre mixing chemicals or wasting what you don't use. Our 63950 M. O. E. backpack sprayer comes with two chemical tanks so you can use one and keep one handy when you need to switch. Clean water