Abstract: An expandable storage system for securely storing materials of various shapes and sizes in an organized, easily identifiable and accessible manner. One or more rows of support members are removeably secured upon a panel so that their positions on the panel may be easily changed in order to secure materials of varying sizes and shapes. A resilient upper support member applies downward pressure on stored materials so that they are held securely against the other support members in order to minimize movement. Additional panels may be quickly added to the system by snapping hinge members to the panel edge and connecting those hinge members, by gravity support, to hinge members on an adjacent panel. Locations are provided for labels and other information relating to stored materials, with no separate space required for the label location. The storage system may be removeably mounted on a structural surface during use and may be secured in a closed configuration similar to a suitcase for transporting.