Impossible I-1 Carrying Case by Unit Portables Description. A series of accessories custom made for the I-1 instant camera by Swedish company Unit Portables. The I-1 can still be used while inside its custom molded case while the interchangeable neck & hand straps make it easy to take the camera wherever you go. Comes with a detachable pouch that holds 1 pack of instant film plus 8 developing photos.