The OXO Pet POP Containers are airtight, stackable and space-efficient, making it easy to keep your dry pet foods fresh, pest-free and organized. The Containers have a unique push-button mechanism that creates an airtight seal with just one touch, keeping curious noses from sniffing out treats. The button also serves as a handle to lift off the lid. The Containers are designed for modular stacking so that you can efficiently organize your pet food. In addition, with their square and rectangular shapes, the POP Containers make the most of any storage space, while their corners allow for easy pouring – especially important with a hungry pet nipping at your feet! They are also great for storing treats, bones, toys, and more! The lid comes apart easily for thorough cleaning. All POP Containers are BPA, PVC, and Phthalate free.