This is a set of Tupperware Vent Smart Rectangular Set of 4, that total comprising of 1 set of VentSmart Rectangular Medium High 4.4 L, 1 set of VentSmart Rectangular Medium Low 1.8 L and 2 sets of VentSmart Rectangular Small High 1.8 L It is coming with build in grid to keeps your vegetable fresh, away from moisture.  The 4 sloped channels allow water to flow out and keep the water from pooling. Each of the vent smart seal, has an integrated air circulation system with a slider, you can chose to set the seal to open full, open half or closed. You can check on the pictures of different kinds of vegetables that printed on the vent smart container, to get know of which vegetables shall store with open 100% seal, 50% open or closed 100%. You can stack the ventsmart containers one after another, without hindering the ventilation system. You can keep your fridge organized, tidy and hygiene by keeping all your foods in your Tupperware ventsmart containers. Besides, you can identify and seek your foods inside the fridge within few seconds :) You can also save your storage space by nesting up your empty vent smart container while not in use. Your vegetables will stay fresh for long time by keeping them inside the vent smart containers. All Tupperware products are covered under Tupperware lifetime warranty. You can replace the broken tupperware containers for free in any tupperware center if it is cracking, skin peel off or wrapping.