Prints, maps, broadsides, and other oversize objects are best stored flat in map drawers or in large covered boxes of preservation quality available from conservation suppliers. It is acceptable to store documents legal-size or smaller in upright archival boxes, but anything larger than 15 by 9 inches should be stored flat. Sheets smaller than 30 by 40 inches will fit into archival boxes, which come in various sizes and are cheaper than map cases. Objects should be protected in neutral or buffered folders cut to fit the size of the drawer or box, since smaller folders tend to shift position as the drawers open and close and get jammed at the back of the drawers. Several objects may be placed in a folder. Items of special value should be interleaved with buffered or neutral tissue paper.
It was traditionally recommended that some items (such as blueprints) should not be stored in alkaline-buffered folders because they are sensitive to alkaline materials and might be damaged by contact with the folders. Recent research, however, has indicated that as long as the relative humidity in the storage area is kept moderate (between 30 percent and 55 percent), alkaline folders should not cause damage.
If map drawers or boxes are not available, or if objects are too large to fit in map drawers, oversize objects can be rolled on tubes, as long as the paper is not too brittle to withstand unrolling. If rolling the object on a tube, use a tube longer than the rolled object and at least four inches in diameter (larger diameters are preferred). If the tube is not archival quality, the object must be wrapped in neutral or buffered paper. Carefully roll the object onto the tube, and wrap the assembly with neutral or buffered paper to protect it from abrasion. This assembly can then be stored inside a larger tube for added protection. Tubes should be stored horizontally. Alternatively, oversize objects can be rolled within a polyester folder. See Storage Solutions for Oversized Paper Artifacts for instructions for making a rolled polyester folder.