A protective hardboard folder for storing herbarium specimens

Many herbaria store their most valuable botanical specimens, such as types, mounted on herbarium paper, within closed or semi-closed pliable cardboard folders. In order to minimise the risk of damage through handling and shipping, an archival hardboard folder was designed, to provide maximum protection. The design accommodates herbarium sheets of different sizes and specimens of various thickness. The folders can be made from materials available from art supply stores.