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"Our stackable TrueSeal Food Storage containers feature compression lids for airtight freshness, spill proof storage and a food-preserving vacuum seal. To use, simply press down on the clear center of the lid to push out the air. You&amp;#39;ll hear the release of air that indicates you&amp;#39;ve created an airtight and spill-proof seal!"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.containerstore.com/s/kitchen/food-storage/y/glass-trueseal-round-food-storage/12bd?refinements=%7Eregister_price%3A0..10&productId=10033269>