The SOLO 425-Deluxe 4-Gallon Professional Piston Backpack Sprayer and SOLO Backpack Accessory Gray and Black xz 4900599 bundle offers a complete spraying system for applying liquids to trees, shrubs, and plants. The 425-Deluxe backpack sprayer features a piston pump that produces up to 90 PSI pressure for effectively spraying fertilizers, pesticides, and other garden chemicals. Its large 4 gallon tank, 28 inch unbreakable wand, foldable handle, and adjustable pressure regulator provide versatile and convenient spraying. The Backpack Accessory includes ventilated, padded, and adjustable shoulder straps along with a padded and ventilated back section with waist belt to promote comfort and support during extended spraying sessions. Its straps are designed to be compatible with Solo 425, 475, and 473 backpack sprayer models. Together, the components form an ergonomic system for tireless and efficient spraying or applying liquids in gardens and landscapes while promoting user comfort through the backpack design.