A container includes a first tray, and a second tray disposed within the space of the first tray to define a reservoir therebetween. The first tray has a first bottom wall and a surrounding first sidewall, which extends generally upwardly from the first bottom wall to define a space therein. The second...http://www.google.es/patents/US7921992?utm_source=gb-gplus-sharePatente US7921992 - Container having internal reservoir
