There were two distinctly different series of Mido holders. The earlier version used a vinyl sleeve over the film. The second version was like a thin regular double sheet film holder, with a separate clamshell spacer. This saves about a third your usual carry weight on half a dozen holders, and takes up less pack space too. I never got along with the earlier type. But I still have a dozen of the second 4x5 version along with two clamshells. These never got much use because not terribly long after, Readyload and Quikload paks came out, yet with growing pains of their own. With the Mido system you have to be careful that no light leaks get between the clamshell and the inner holder itself, once the darkslide is pulled. I had a few minor accidents with them, but overall, bagged most of my shots just fine. Hard to say if I'll use them again. He apparently made very few 5x7 and 8x10 holders.
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