The case I ordered with the light is
this one made by Sony, I don't have it yet to tell how much bulk it will add, but I needed a light even for reading at home at times.
But I'm pretty sure I'm also going to get a smaller case just for taking out during the day when I don't need a light with me, probably one of these
M-Edge cases, or have
one of these made by KreatedByKim. This
clip-on lamp seems to be a favorite of users here also when I was looking into which light to get.