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Mug Root Beer

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An American root beer brand originating in San Francisco and now associated with PepsiCo.

Last updated October 14, 2026

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Overview

Mug Root Beer is an American carbonated soft-drink brand whose history traces to San Francisco in 1940, when Belfast Beverage Company introduced a root beer under the name Belfast Root Beer. Belfast Beverage had a much older beverage-making background: the company was known for sparkling water and ginger ale, while its corporate history was connected to New Century Beverage Company, a San Francisco business that had launched Crush Soda in 1918. New Century Beverage Company acquired Belfast Beverage Company around 1925 and later received permission to franchise Pepsi-Cola products in 1936. The root beer was introduced during this period of changing ownership and brand development. Early advertising appeared by the late 1940s, and newspaper promotions in the 1950s emphasized the drink's distinctive, old-fashioned character. During that decade, the product was marketed under the longer name Belfast Old Fashioned Mug Root Beer before the brand was generally shortened to Mug Root Beer. The Mug identity subsequently became the principal consumer-facing name. The brand expanded beyond its original full-sugar root beer. A sugar-free variant appeared in the late 1960s and was later known as Diet Mug Root Beer. Mug Cream Soda and Diet Mug Cream Soda were also introduced, although these products have generally had more limited availability than the flagship root beer. The brand's visual identity has featured a bulldog commonly referred to as Dog, shown holding a glass of foaming root beer. Pepsi acquired Mug in 1986, making it Pepsi's principal root beer brand and replacing On-Tap Draft Style Root Beer in that role. Mug is therefore part of PepsiCo's broader carbonated beverage portfolio, although the brand's manufacturing and distribution history has involved independent bottlers operating under the authority of New Century Beverage Company. PepsiCo ended soda production in San Francisco in the early 1990s, including production associated with Mug Root Beer, while the brand continued in the marketplace through its broader bottling and distribution system. Mug Root Beer's positioning is built around familiar American root beer cues: a sweet, creamy, highly carbonated soft drink presented as an indulgent, nostalgic alternative to cola. Its strongest identity remains the original Mug Root Beer product, supported at different times and in different markets by diet and cream-soda extensions. Publicly available reference material provides limited information about current corporate operating arrangements, international distribution, recent campaigns, and detailed sales performance; no financial figures are included here.

History

Mug Root Beer's documented history begins in San Francisco in 1940, when Belfast Beverage Company introduced Belfast Root Beer. Belfast Beverage had roots in the city's soft-drink trade and was associated with the production of sparkling water and ginger ale dating back to the late nineteenth century. Around 1925, Belfast Beverage was purchased by New Century Beverage Company, another San Francisco beverage enterprise that had introduced Crush Soda in 1918. New Century's business later became connected to Pepsi-Cola. In 1936, it obtained permission to franchise Pepsi-Cola products, and approximately four years later the business launched Belfast Root Beer. This timing places the root beer's introduction within a period when regional beverage companies were combining local manufacturing, franchising, and branded soft-drink distribution. The product was advertised by at least 1947. During the 1950s, promotional material used the name Belfast Old Fashioned Mug Root Beer and presented the drink as a distinctive traditional-style root beer. Newspaper advertising used the slogan-like line "You haven't tasted Root Beer like this in years!" The longer Belfast name was eventually dropped, leaving Mug Root Beer as the established brand name. Product extensions followed. Sugar Free Mug was introduced in the late 1960s and was subsequently known as Diet Mug Root Beer. Mug Cream Soda and Diet Mug Cream Soda were also introduced, though the available reference material indicates that they were less broadly available than the main root beer. These extensions gave the brand a presence in both diet soft drinks and cream soda while keeping Mug's root beer identity at the center of the portfolio. Pepsi acquired Mug in 1986. The transaction changed Mug's role in the Pepsi beverage portfolio: Mug replaced On-Tap Draft Style Root Beer as Pepsi's root beer brand. Since that acquisition, the logo has included a bulldog known as Dog, depicted holding a glass of frothy root beer. The mascot and the product's name reinforce the brand's approachable, nostalgic presentation. PepsiCo later stopped producing its sodas in San Francisco in the early 1990s, including Mug Root Beer. The brand nevertheless remained in the market. Current reference material describes Mug as being manufactured by independent bottlers under the authority of New Century Beverage Company, while its ownership is associated with PepsiCo. This reflects the distinction between brand ownership and the local or regional bottling arrangements commonly used in the soft-drink industry. Mug Root Beer's historical significance is primarily regional and category-based rather than tied to a single celebrity founder or a separately listed public company. It developed from a San Francisco beverage business, passed through a period of regional brand expansion, became Pepsi's root beer label through the 1986 acquisition, and continued as an established American soft-drink brand. Public references do not provide a complete account of current markets, recent advertising, executive leadership, or product availability by territory, so those areas remain limited in this dossier.

  • 1990

    San Francisco soda production ends

    [1]

    PepsiCo stopped producing its sodas in San Francisco in the early 1990s, including Mug Root Beer.

  • 1986

    Pepsi acquires Mug

    [1]

    Pepsi acquired the brand and replaced On-Tap Draft Style Root Beer with Mug as its root beer label.

  • 1960

    Sugar Free Mug is introduced

    [1]

    A sugar-free version of the root beer was introduced in the late 1960s and was later known as Diet Mug Root Beer.

  • 1952

    Mug naming appears in advertising

    [1]

    Advertising for Belfast Old Fashioned Mug Root Beer appeared by this period, reflecting the transition toward the Mug name.

  • 1947

    Early Belfast Root Beer advertising

    [1]

    Advertising for Belfast Root Beer is documented by this year.

  • 1940

    Belfast Root Beer is introduced

    [1]

    Belfast Beverage Company introduced the root beer that would eventually become Mug Root Beer.

  • 1936

    New Century receives Pepsi-Cola franchise permission

    [1]

    New Century Beverage Company was granted permission to franchise Pepsi-Cola products.

  • 1925

    New Century acquires Belfast Beverage

    [1]

    New Century Beverage Company purchased Belfast Beverage Company around this time.

  • 1918

    New Century launches Crush Soda

    [1]

    New Century Beverage Company, later connected with the Mug history, launched Crush Soda.

  • 1877

    Belfast Beverage's earlier beverage operations

    [1]

    Belfast Beverage Company was associated with the production of sparkling water and ginger ale in San Francisco from this period.

Products and positioning

A nostalgic, indulgent American root beer positioned around a distinctive old-fashioned flavor profile, strong carbonation, and recognizable bulldog branding.

  • Diet root beer · 1940

    Diet Mug Root Beer

    The flagship full-sugar product and the principal expression of the Mug brand. It descends from the Belfast Root Beer introduced in San Francisco in 1940 and later marketed as Belfast Old Fashioned Mug Root Beer before the shorter Mug Root Beer name became standard. The product is presented as a sweet, carbonated, old-fashioned-style root beer and is associated with the brand's bulldog mascot. The diet extension of the core root beer line. It originated as Sugar Free Mug in the late 1960s and was later renamed Diet Mug Root Beer. It provided a reduced-sugar alternative while retaining the Mug root beer identity. Specific current formulation and market availability are not established by the supplied references.

  • Diet cream soda

    Diet Mug Cream Soda

    A cream-soda extension introduced after the development of the core Mug root beer line. Reference material indicates that Mug Cream Soda has generally been less widely available than Mug Root Beer. The supplied sources do not establish a precise launch year or a complete current distribution footprint. A diet version of Mug Cream Soda. It extended the brand into the diet cream-soda segment, although the available historical reference describes both cream-soda products as less widely available than the flagship root beer. Precise launch timing and current availability are not established.

Marketing campaigns

  • 1950Old-fashioned root beer newspaper advertising

    United States

    1950s newspaper advertising promoted the product's distinctive character with the line "You haven't tasted Root Beer like this in years!" and used the Belfast Old Fashioned Mug Root Beer naming.

    Outcome. Supported the transition from the Belfast name toward the shorter Mug Root Beer identity.

Brand decisions

  • 1990

    Move production away from San FranciscoStrategy

    Background

    PepsiCo ended soda production in San Francisco in the early 1990s.

    Action taken

    Production of PepsiCo sodas made in San Francisco, including Mug Root Beer, was discontinued there.

    Aftermath

    Mug remained available through independent bottlers operating under the authority of New Century Beverage Company and through broader distribution channels.

  • 1986

    Pepsi acquires Mug Root BeerM&A

    Background

    Pepsi required a principal root beer brand within its carbonated soft-drink portfolio.

    Action taken

    Pepsi acquired Mug and designated it as its root beer brand, replacing On-Tap Draft Style Root Beer.

    Aftermath

    Mug became associated with PepsiCo while manufacturing and distribution continued through bottling arrangements.

  • 1960

    Launch sugar-free root beerProduct launch

    Background

    The brand expanded beyond its original full-sugar root beer offering.

    Action taken

    Sugar Free Mug was introduced in the late 1960s and later became known as Diet Mug Root Beer.

    Aftermath

    The line gained a diet extension, with later cream-soda variants also associated with the brand.

  • 1950

    Adopt the Mug identityStrategy

    Background

    The product was initially sold as Belfast Root Beer and was later promoted under the longer Belfast Old Fashioned Mug Root Beer name.

    Action taken

    The brand eventually shortened its market name to Mug Root Beer.

    Aftermath

    Mug became the lasting consumer-facing identity for the root beer.

Sources1 sources

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