Unique Pop Top DesignThe container lid adopt unique pop design, Push the button to engage the airtight seal. The button doubles as a handle for the lid. One-handed operation, easy and convenient. Set includesThis set provides 4 different sizes container: 3.4qt, 2.8qt, 2.1qt and 1.2qt for storing different foods such as pasta, coffee, sweets and snacks. BPA Free MaterialContainers are made of durable food-grade AS material, safe for children and adults. 100% AirtightThese pop containers are airtight and leakproof to keep your dry foods fresh. StackableThe pop containers are stackable, making it easy to keep your kitchen pantry organized.