Tupperware Modular Mates Oval I (4) 500ml (Black) KITCHEN STORAGE, THE MAGIC SPACE MAKER: WITH CUSTOM KITCHEN PLANNING, EACH MODULAR MATES CONTAINER HAS A PERMANENT POSITION - NO FOOD ITEM GETS LOST OR DUPLICATED. MODULAR MATES CONTAINERS STACK TOGETHER, ENSURING EVERY INCH OF SPACE IS PUT TO WORK. TABS FOR EASY OPENING & VIRTUALLY AIR & LIQUID TIGHT SEAL KEEPS FOOD FRESH. EASILY STACKABLE TO MAXIMIZE STORAGE SPACE, CLEAR WINDOW TO SEE CONTENTS CLEARLY, BUYING YOUR FOOD IN BULK IS EASY WITH MODULAR MATES CONTAINERS MADE FOR STORING THE MOST ECONOMICAL SIZES, NO MORE SPILLS - MODULAR MATES CONTAINERS SEAL AND STACK SNUGLY, TO SEAL, ALIGN PROJECTION ON SEAL WITH INDENTATION ON CONTAINER, THEN PRESS THUMBS AROUND SEAL. TO REMOVE SEAL, LOOSEN EACH CORNER AND SLIDE THUMBS UNDER THE SEALS AS YOU LIFT.