Case Size: 4/1 gal. A bulk 1-gallon size of the rich and creamy Japanese mayonnaise, ideal for foodservice or heavy home use. Kewpie Mayonnaise (1 gal) is a luxurious, creamy mayonnaise made with egg yolks for a rich, smooth flavor. It's ideal for use in sandwiches, salads, and sauces, offering a unique taste that sets it apart from traditional mayonnaise.