Growth stocks are attractive to many investors, as above-average financial growth helps these stocks easily grab the market's attention and produce exceptional returns. However, it isn't easy to find a great growth stock.That's because, these stocks usually carry above-average risk and volatility. In fact, betting on a stock for which the growth story is actually over or nearing its end could lead to significant loss.However, it's pretty easy to find cutting-edge growth stocks with the help of the Zacks Growth Style Score (part of the Zacks Style Scores system), which looks beyond the traditional growth attributes to analyze a company's real growth prospects.Packaging Corp. (PKG) is on the list of such stocks currently recommended by our proprietary system. In addition to a favorable Growth Score, it carries a top Zacks Rank.Research shows that stocks carrying the best growth features consistently beat the market. And returns are even better for stocks that possess the combination of a Growth Score of A or B and a Zacks Rank #1 (Strong Buy) or 2 (Buy).Here are three of the most important factors that make the stock of this maker of containerboard and corrugated packaging products a great growth pick right now.Earnings GrowthEarnings growth is arguably the most important factor, as stocks exhibiting exceptionally surging profit levels tend to attract the attention of most investors. For growth investors, double-digit earnings growth is highly preferable, as it is often perceived as an indication of strong prospects (and stock price gains) for the company under consideration.While the historical EPS growth rate for Packaging Corp. is 7.8%, investors should actually focus on the projected growth. The company's EPS is expected to grow 30.3% this year, crushing the industry average, which calls for EPS growth of 15.8%.Impressive Asset Utilization RatioAsset utilization ratio -- also known as sales-to-total-assets (S/TA) ratio -- is often overlooked by investors, but it is an important indicator in growth investing. This metric exhibits how efficiently a firm is utilizing its assets to generate sales.Right now, Packaging Corp. has an S/TA ratio of 0.91, which means that the company gets $0.91 in sales for each dollar in assets. Comparing this to the industry average of 0.85, it can be said that the company is more efficient.While the level of efficiency in generating sales matters a lot, so does the sales growth of a company. And Packaging Corp. looks attractive from a sales growth perspective as well. The company's sales are expected to grow 9.9% this year versus the industry average of 6.6%.Promising Earnings Estimate RevisionsSuperiority of a stock in terms of the metrics outlined above can be further validated by looking at the trend in earnings estimate revisions. A positive trend is of course favorable here. Empirical research shows that there is a strong correlation between trends in earnings estimate revisions and near-term stock price movements.There have been upward revisions in current-year earnings estimates for Packaging Corp. The Zacks Consensus Estimate for the current year has surged 0.9% over the past month.Bottom LineWhile the overall earnings estimate revisions have made Packaging Corp. a Zacks Rank #2 stock, it has earned itself a Growth Score of B based on a number of factors, including the ones discussed above.You can see the complete list of today's Zacks #1 Rank (Strong Buy) stocks here.This combination indicates that Packaging Corp. is a potential outperformer and a solid choice for growth investors. More Stock News: This Is Bigger than the iPhone! It could become the mother of all technological revolutions. Apple sold a mere 1 billion iPhones in 10 years but a new breakthrough is expected to generate more than 77 billion devices by 2025, creating a $1.3 trillion market. Zacks has just released a Special Report that spotlights this fast-emerging phenomenon and 4 tickers for taking advantage of it. If you don't buy now, you may kick yourself in 2022.Click here for the 4 trades >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Packaging Corporation of America (PKG): Free Stock Analysis Report To read this article on Zacks.com click here.