Does rule 43.1
(a) permit a competitor to wear or otherwise attach to his person a beverage container while racing?
No. Except on a windsurfer or a kiteboard, there is no necessity for such a practice, and therefore its primary purpose must be considered to be to increase the competitor's weight. (Note that rules B4
modify rule 43.1
(a) for windsurfing competition and kiteboard racing.)
World Sailing 1997