They fit box files and foolscap files perfectly. They have self locking bottoms so no tape required and they have handles for easy carrying. These are bigger than most of the archive boxes listed on here which makes them excellent value.
Lineco Archival 11 x 14 inches Print Storage Box, Drop Front Design, 11 1/2 x 14 1/2 x 3 inches, Exterior Color: Black : Electronics
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Lineco Archival Document Storage Box with Metal Edge, Acid-Free Gray Boxboard, Organize and Store Files, Prints, Photos at Home or Office, Letter-Sized Document Case 12.5 x 10.5 x 5 Wide
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Large Archive Storage Cardboard Boxes Pack Of 15 Office Removals Files