File:16mm movie film shipping case.jpg - Wikimedia Commons

Journal of Film Preservation - FIAF

These are in good used condition with wear as shown and with 2 large size (13 x 13) and 4 smaller size (10 x 10).

6 Vintage 16mm Film Mailing Mailer Shipping Boxes With Straps Home Theater Decor

STiL® 16mm Film Container - Stil Casing

Ilford Delta 3200 135-36 10 Roll Pack : Photographic Film : Electronics

Achieving a Super 16mm Film Look When Shooting Digitally

File:Diskette box (2).jpg - Wikimedia Commons

Archival 16mm Film Container - 1200 ft.

AP161200 16mm / 1200 ft. Film Container

Watch Zora Neale Hurston: Claiming a Space, American Experience, Official Site

1937 Cine' Kodak Model E 16mm Movie Camera - Camera Concepts & Telescope Solutions