to answer the original question--they do see your film very clearly, on a slightly darker background of the bag shape. a couple of times (out of a hundred perhaps, worldwide) they asked me what it was; normally it just glides through. based on shading levels, the bags offer little protection. since i have them already, since they help me organize those dozens of rolls, and since the film has never suffered any harm--i keep using them one for fresh, one for exposed

my hama bag comes out darker on the screen than my domke bag