3-Day Harvest has been scientifically formulated and field-tested under real hunting conditions. 3-Day Harvest uses the animal's most powerful sense-smell- to attract deer like a magnet. And it keeps them coming back for more with its highly palatable, great tasting formula. That's the power of the 3-Day Harvest System- irresistible smell, great taste and more action. 2-Gallon container. Best to buy in case lots of 4.