Materials vary by product. Common materials include polyester, general plastics, polyurethane, and acrylic. One fireproof option notes an exterior of upgraded anti-static double-layered silicone-coated fiberglass with a polypropylene (PP) interior.
Many containers are made for letter-size documents. Several descriptions explicitly state they accommodate letter and legal-size files or hanging letter-size folders. Smaller pouches and holders are sized for standard 8.5" x 11" paper.
Portability features commonly listed include sturdy or contoured top handles, carry-through handles for easier lifting, and overall descriptions like "portable" or "easy to carry."
Stacking and modular designs are common: some file boxes have indexed covers designed for stable stacking, and many crates are built to stack vertically or horizontally to create customizable storage.
Capacity is reported in different ways: some listings give quart volumes (examples: 22 quart and 30.6 quart), while others provide outside dimensions or specify folder compatibility instead of a quart measurement.
Features vary by product: fireproof/document bags may use double zippers or combination/password locks; some file boxes have durable latches that accept a small padlock or zip tie; other document holders use simple snap, button, or zipper closures.
Common internal organization features include in-lid compartments, internal pockets and file pockets, label papers, mesh pockets or bags, card slots, small device/USB pockets, inner ridges to align folders, and larger main pockets for bulk items.
