Airtight silicone seals expel excess air by Vacuum action, and reduces exposure to harmful bacteria!Tired of wondering when did I put that in the fridge-...the built-in date dials let you know just when you vacuum sealed your leftovers!Safe for microwave, dishwasher and freezer. Sizes: 9.84 x 9.84 x 4.74; 8.66 x 7.87 x 3.95