Helen of Troy has reported a sales increase of 16.3 percent to $98.4 million for its Housewares segment in the first quarter ended May 31. The segment's organic growth of 9.7 percent was led by the Hydro Flask and OXO brands. The segment's operating margin of 18.4 percent was down slightly on an adjusted basis because of higher product development and marketing expenses, plus unfavorable exchange rates. While expanding its product range and growing internationally, Hydro Flask gained further market share in the U.S. market for beverage bottles.