Oxo POP Food Storage Containers
"Airtight, stackable and space-efficient, these modular stacking units come in square and rectangular shapes and have a unique push-button mechanism that creates an airtight seal with one pop. (The 4-quart size holds a 5-pound bag of flour or sugar.) The pop-up button serves as a handle to lift the lid, which also comes apart for thorough cleaning." As seen in the
Philadelphia Inquirer, "Market Basket".