I have bought many sets of these. They take up very little space, seal easily and stay sealed. I always keep them on hand. When I have big family dinners, I get out a stack of these and encourage everyone to take lots of leftovers home. I'm happy as I can be generous and don't have to put away many leftovers! The family members are happy to have good food in good containers that they can reheat. These are a great buy.