Shares of Packaging Corporation of America (PKG) have scaled a new 52-week high of $204.58 on Aug 23, before closing the session lower at$203.81.PKG currently has a market capitalization of $18.3 billion and flaunts a Zacks Rank #1 (Strong Buy).So far this year, Packaging Corp’s shares have gained 25.1%. PKG has outperformed the industry's 14% growth and the S&P 500’s 18.1% rise. Meanwhile, the Industrial Products sector has gained 7.9%.  Image Source: Zacks Investment ResearchWhat’s Driving the PKG Stock? ...