The MESTO 3552 3.5 Gallon is the perfect backpack sprayer for professional users. It offers plenty of comfort, such as an ergonomically shaped pump lever whose length and width can be adjusted and a shut-off valve with pressure gauge and integrated filter. Holds 3.5 Gallons (12 liters). Additional Details ------------------------------ Product description: The MESTO 3552 3.5 Gallon is the perfect backpack sprayer for professional users. It offers plenty of comfort, such as an ergonomically shaped pump lever whose length and width can be adjusted and a shut-off valve with pressure gauge and integrated filter. Holds 3.5 Gallons (12 liters).