<P> In 2017, the company increased staff at its London headquarters and expanded its retail sales to 65 countries worldwide . That same year, the company relocated its Manhattan headquarters to a larger office space . </P> <P> In September of 2018, the company partnered with New York City's Department of Education which gave out their Swell water bottles to 600 different high schools including Stuyvesant High School and the Bronx High School of Science . The bottles were given out for free to 320,000 students in New York City's public school and Charter School system . Although not stated, the generous donation would also increase their brand awareness which would eventually lead to further product growth . </P> <P> The company sells bottles that hold 9 US fluid ounces (270 millilitres), 17 US fl oz (500 ml) or 25 US fl oz (740 ml). The bottles are reusable and include triple - walled insulation . The manufacturer claims the bottles are non-leaching, non-toxic and maintain the content's temperature for 12 to 24 hours . </P> <P> A 2015 consumer report tested the efficacy of the S'well bottle . Initially filling the bottle with water at 40 degrees Fahrenheit (4 degrees Celsius), the testers compared changes in temperature using a regular plastic bottle as the control . After five hours, the plastic bottle's water temperature read 79 ° F (26 ° C) while the S'well's water read 41 ° F (5 ° C). After twenty - four hours, the plastic bottle's water was at 84 ° F (29 ° C), the S'well's water at 69 ° F (21 ° C). Testing the product's heat retention claim, the testers filled the bottle with hot coffee . The initial temperature was above 168 degrees Fahrenheit (76 degrees Celsius). Six hours later, the thermometer read more than 140 ° F (60 ° C). Twelve hours later the temperature was 126 ° F (52 ° C), dropping more than 40 degrees Fahrenheit (4.4 degrees Celsius). </P>

How many litres of water in a swell bottle
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