A food storage container includes a lid with a vent hole, and a removable cover removably secured to the lid to cover the vent hole. The cover has an evacuation hole. The food storage container further includes a one-way air valve disposed between the vent hole and evacuation hole. With the cover secured...http://www.google.es/patents/US7096893?utm_source=gb-gplus-sharePatente US7096893 - Food storage containers
