Though it's not because us Brits just love to keep hydrated.
No, 138 rely on skimpily clad models to drum up attention and their latest campaign is no exception.
Canadian Model Cate Chant shows off her smoking hot body
Dressed in a skimpy orange bikini, model Sammy Mitchell wows as she flaunts her petite frame on a sun-kissed Malibu beach.In one shot the star can be seen seductively flipping her hair in the breeze while in another Sammy proudly pushes out her booty for extra sex appeal.
However, in a bizarre break of tradition, the brand have failed to get Sammy to pose with their trusty bottle of water.
Speaking about the pageant, Sammy said: "After all the hard work and effort I have put in to this competition, I can excitingly announce I placed in the top five in the world and that hard work has definitely paid off.
"I couldn't have done this without my sponsors, mentors, family & friends."
"To the runner ups and all the beautiful contestants who competed, you all did amazing and we are all winners in my eyes."