Hefty Quart Freezer Bags. Stronger seal. Than Ziploc bags**. *When shaken, dropped or stacked. Maxlock track design extra strong seal. Easy to open or close in one simple sliding motion. Clicks Closed so you know it's Closed. Zipping sound indicates the seal is secure. 100% Recycled paperboard. Please recycle. When communicating about this particular product, please include and flap with the embossed numbers, or laser printed white numbers and the UPC bar code located on this panel. Ziploc is a registered trademark of S.C. Johnson & Son, Inc. Reynolds Consumer Products. 2013 Reynolds Consumer Products Inc.