U.S. patent application 20150232266 (applicant Sonoco Development Inc., Hartsville, S.C.):
"A packaging system for a temperature sensitive payload is provided. The system comprises insulative panels, including side panels and end panels, forming a product compartment. Cooling layers within the product compartment are located below and above the products. Channel members affixed to the side panels and/or the end panels create spaces and channels for convective air movement. ... Each frozen component may comprise a phase change material and a protective outer container."