Glad Food Storage Containers, Family Size, are tight sealing and extra sturdy, and allow you to take your leftovers right from the refrigerator or freezer to the microwave. Use these BPA free containers to pack an array of main courses for a potluck social or freeze large leftovers for future use. These containers seal tight and lock in freshness securely and easily. They are dishwasher safe and stack neatly for cupboard storage. At home or on the go, GLAD seals in goodness.