Abstract: This invention relates to shipping containers and methods for the transportation perishable or temperature-sensitive materials at stable temperatures. Materials within the container are maintained in a narrow temperature range by a passive temperature control device. The device and the perishable materials are placed in the container, separated by a structured barrier. Structured barriers comprise materials of predefined thickness and placed so that perishable materials do not come into direct contact with the temperature-control device, but has a plurality of notches that allow for limited air circulation. Preferably the assembled container is covered with a fitted lid to minimize temperature transfer between the outside and inside of the container.