The Costco Service Deli Rainbow Roll is a freshly prepared sushi roll sold by the pound. A rainbow roll is a classic inside-out sushi roll featuring a California roll base — imitation crab, cucumber, and avocado — topped with colorful, alternating slices of assorted fish such as tuna, salmon, yellowtail, and avocado, creating a visually striking "rainbow" appearance along the top of the roll.

Prepared fresh daily in select Costco warehouse locations, the Service Deli rainbow roll is a popular option for entertaining, parties, or a quick ready-to-eat meal. As a by-the-pound item, customers can purchase exactly the quantity they need. The roll is typically served with soy sauce, wasabi paste, and pickled ginger. It is best consumed the same day of purchase.

Sushi availability and specific ingredients may vary by warehouse location. Costco's fresh sushi program is supplied regionally by vendors such as Snowfox Sushi (JFE Foods) in the United States and Itsumo Sushi (All Seas Fisheries) in Canada.