RX100 slip case - i know its been done to death, but none seem right for me.

Given the size of the camera, I use a microfiber pouch, no lining. Since I carry nothing in my pockets, the camera is in no danger of being damaged by keys, etc. I try to remember to have the screen against my thigh. Works very well for me, but I am super careful. I do not like cameras on a belt. (Google microfiber pouch. Plenty of options.)