Wine packaging continues to trend toward lighter-weight glass, particularly at a time of cost-cutting and rising energy prices. Transporting glass in addition to wine became a financial as well as environmental concern in 2008 as fuel prices spiked and trucking companies tacked on surcharges. Now uncertainty about global petroleum supplies has sent fuel prices in the U.S. to nearly $4 a gallon, with some predicting it could go as high as $5 this year.