The OXO Good Grips POP Containers are airtight, stackable and space-efficient, making it easy to keep dry foods fresh and kitchens organized. The containers have a unique push-button mechanism that creates an airtight seal with just one touch. The button also serves as a handle to lift off the lid. The containers are designed for modular stacking for efficient organization of countertops and pantries. Their square and rectangular shapes (available in 11 sizes) allow the containers to make the most of any storage space and their corners allow easy pouring. The lid comes apart for thorough cleaning.