Microchannel device for controlling gas, vapor, pressure within a package

A multilayer perishable food packaging structure having a microchannel therein, comprising:

• a first layer of material comprising a first breach in communication with an interior of a perishable food package and a second layer of material comprising a second breach in communication with an exterior of the perishable food package, the second layer of material further comprising a laser-ablated microchannel in communication with the first breach and the second breach, the laser-ablated microchannel configured to have a flow of air equivalent to a micro-perforation of 200 micrometers in diameter to 0.01 micrometer in diameter, and to enable carbon dioxide to flow through at a faster rate than oxygen or aromatic gas molecules.