Just when it looked like the glass bottle's time in the spotlight had come and gone, suddenly it is in demand again, this time thanks mainly to the popularity of super-premium spirits. Beverage marketers of these and other upscale beverages are choosing glass over other options-and even in some cases switching back to glass from plastic. "Although the perception that converting from glass to plastic is, due to our mobile market, the next logical step, some companies have learned the hard way that plastic conversions don't necessarily mean positive sales increases," points out Mary Reis, spokesperson for the Washington, DC-based GPI "A great example is Smirnoff 1.75L Vodka. They spent 3 years engineering a plastic bottle & within a year, converted back to glass. They learned the hard way that a premium perception is more valuable than an unbreakable bottle."