Complete with their own handy vacuum pump, these Seal'In 9-pc. Nestable Storage Containers each have a patented silicone valve—allowing you to pump out excess air so food stays fresher longer! Opening easily and closing tightly with side clips, the plastic containers store food in pantry, fridge or freezer, and can be used with or without lids in the microwave (when used with lids, valves allow steam to escape). Nesting for space-saving storage when not in use, the 9-pc. set includes 1 vacuum sealer pump plus 4 containers and 4 lids in these versatile sizes: 600 ml (20 oz.), 1.0L (1.1 qt.), 1.4 L (1.5 qt.) & 4.7 L (5.0 qt.). Made from durable, BPA-free polycarbonate; dishwasher safe.