Hmmm... do you guys know that there's actually a 110 film? It was very popular long time ago and co-existed with 35mm film. 110 film is actually cartridge-loaded film and virtually impossible to make mistakes loading and unloading, as there're cartridges on both ends so wrong loading is a no-issue. The pocket cameras (even as small as to be fitted onto key-chains) were all using the 110 film. The drawback was that the film size was small and tended to be a bit grainy (yeah... it was a long time ago and even ISO200 film tended to be a bit grainy). 110 film died out in the 1980s... but like the VW Beetle I heard some countries still have stocks!