US Patent 7883268 Package having a fluid actuated closure

The package generally includes at least first and second panel portions operably connected to define an interior cavity therebetween. The first panel portion can include a fluid chamber operably disposed along a portion of the first panel portion such that a portion of the fluid chamber is adapted to operably abut or confront the second panel portion to generally block an access opening into the interior cavity. The second panel portion can further include a fluid chamber.