SOUTH PLAINFIELD, N.J.--(BUSINESS WIRE)--Tumi Holdings, Inc. (NYSE:TUMI), the leading global brand of premium travel, business and lifestyle products and accessories, today announced its financial results for the second quarter ended June 28, 2015. Jerome Griffith, Chief Executive Officer and President, commented, “Our strong financial results in the second quarter were driven by sales growth of 11%, gross margin expansion of 100 basis points, operating income growth of 27%, and net income grow