Many many years ago when 110 was very popular, the Boots company in the UK sold a photo album with pages of some kind of plastic into which you slid four prints per side. At the back of the album was another plastic type sheet with channels designed to each take a strip of 110 negatives. That's the only time I've ever found negative sleeving designed for 110/16mm negatives. I've actually been looking recently but without success. If someone can make them for the Minox size, you would think they could do it for 16mm too, but obviously not!