Flavor, scent and price are all variables that consumer product makers juggle to sell their wares, and now there’s another one–the size of the cap on a bottle of laundry detergent.Over the next two years, Dial Corp., Scottsdale, AZ, said it plans to increase the size of the caps on its Purex bottles to 5.5-oz., hoping to encourage consumers who measure detergent by the capful to use more, according to Greg Tipsford, senior vice president, laundry care. The company currently has 3.5-o...