Help protect your meats, vegetables and other foods from harmful freezer burn with Hefty Slider Freezer Bags. Hefty Freezer Bags have a stronger seal when shaken, dropped or stacked. The patented MaxLock track can be opened with a single sliding motion, and it clicks closed so you know your food will stay fresh. In addition, they are made from a thicker material to ensure your foods don't feel the burn. Whether you?re freezing meat, cookie dough or leftovers, count on Hefty to help you stay on track. Hefty Freezer Bags may be used in the microwave to defrost or reheat foods. Place bag on a 'microwave safe' plate or dish. Open slider at least 1 inch to vent air. Do not overheat food or bag may melt and break. Not for roasting, baking or boiling.