In large collections, begin each series in new box. In smaller collections, a single box may contain more than one series.
When necessary, fill empty space in a box with a piece of acid-free corrugated board or spacer, which can be folded to size.
The weight of any packed box should not exceed 35 pounds, except in rare cases when it is unavoidable due to the nature of the materials (example: lead printing plates). If you are unsure about the heaviness of a box, use a scale to weigh it, and split it up into two or more lighter boxes if it exceeds the weight limit.
Leave space for items temporarily removed. If you anticipate that material sent for conservation, once treated, will be returned to general use, try to leave adequate space in the box to accommodate it. Use filler board in the meantime to keep other material in the box upright. If the material cannot be handled safely even after conservation, file as Restricted Fragile.
Audiovisual reformatting can take some time, and processing may be complete before material is returned. Make sure to leave room for both surrogates and originals in the appropriate places.