Spine width sets how many fit a shelf run, and mixing widths across a storeroom wastes space you cannot recover later, so standardise before you fill the first shelf. The internal clip matters if the box travels or tips, since loose contents in a box file end up in the wrong order. Label the spine, not the lid. See archive boxes, lever arch files and file storage.

Box files arranged on a bright office desk with stored documents, filing shelves, stationery and organised workplace storage.

Box Files for Office Document Storage

Shop box files and heavy duty box files for documents, records, reports and organised office filing.