Acid free storage boxes or boxes made from fluted polypropylene are good alternatives. Corrugated cardboard boxes, although readily available, should be avoided as they are highly acidic and will, in time, degrade the contents. The material holding the covers should then be placed in acid free file folders and stored vertically in baked enamel metal filing cabinets. Alternatively, if you insist on using wooden cabinets, be certain that they are thoroughly sealed with a high quality waterproof urethane or a good latex paint such as Pratt and Lambert's Vapox. Acid free slip covers and boxes are available commercially in various sizes, but it is often more suitable to construct simple custom-designed enclosures.
Materials are readily available.
Two practical types of enclosures are described in Figure 8. Patterns for custom-made storage boxes. The following gives the equipment and materials required to construct custom-made storage boxes and the general directions for the construction of the containers. Cut out the pattern. When matboard is used, score along the dotted lines with a sharp knife to make folding possible.