Hefty Slider Freezer Calendar Bags provide a simple strategy for solving the mystery of what you’ve stored and for how long. Simply use the large write-on labels on these storage bags to label the contents, circle the month and date on the printed-on calendar, and store away! No more guesswork. The thicker plastic and extra-strong seal on these easy-to-use slider freezer bags help keep food fresh and protected from freezer burn. The patented, easy-to-use MaxLock track and Clicks-Closed feature lets you know when these BPA-free plastic bags for food storage are securely closed. Plus, the stand-and-fill expandable bottom makes it easy to load leftovers, meal prep, fruit, and more into these gallon slider bags with ease. Hefty's premium quality and super strength come with superior savings and a 100% satisfaction guarantee.