This is the Plus Shell Trek 04 Zoom Bag S from HAKUBA. It's very lightweight and can store a mirrorless single-lens reflex camera plus one lens, as well as a flash and small accessories. It can be used as a shoulder bag or as a waist bag. It comes with a rain cover, so you can use it with peace of mind even on sudden rainy days. It has been used only a few times, and while there is a slight feeling of use, it is generally in clean condition.