Sierra Mist is a lemon-lime

Lemon-lime

Lemon-lime is a common carbonated soft drink flavor, consisting of lemon and lime flavoring. Sprite and 7 Up are the most popular examples.-Description:...

 flavored caffeine-free soft drink

Soft drink

A soft drink is a non-alcoholic beverage that typically contains water , a sweetener, and a flavoring agent...

, introduced by PepsiCo

PepsiCo

PepsiCo Inc. is an American multinational corporation headquartered in Purchase, New York, United States, with interests in the manufacturing, marketing and distribution of grain-based snack foods, beverages, and other products. PepsiCo was formed in 1965 with the merger of the Pepsi-Cola Company...

 in 2000 and rolled out nationally in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 in 2003. PepsiCo owns the rights to the similar 7 Up

7 Up

7 Up is a brand of a lemon-lime flavored non-caffeinated soft drink. The rights to the brand are held by Dr Pepper Snapple Group in the United States, and PepsiCo in the rest of the world, including Puerto Rico, where the concentrate is manufactured at the Pepsi facility in Cidra...

 brand outside the U.S. and therefore has not yet introduced Sierra Mist in international markets.
Following initial test marketing, PepsiCo first introduced Sierra Mist in 2000, replacing similar soft drinks such as lemon-lime Slice

Slice (soft drink)

Slice is a line of fruit-flavored soft drinks manufactured by PepsiCo and introduced in 1984, with the lemon-lime flavor replacing Teem.Varieties of Slice have included apple, fruit punch, grape, passionfruit, peach glaze, Mandarin orange, pineapple, strawberry, Cherry Cola, "Red", Cherry-Lime, and...

 and the test-marketed Storm

Storm (soft drink)

Storm was a lightly carbonated, caffeinated lemon-lime flavored soft drink. It was test marketed by PepsiCo in some areas of the U.S. in 1998 as part of Pepsi's attempt to become more competitive in the U.S. clear lemon-lime soda market, one which was dominated by The Coca-Cola Company's Sprite...

.