I wanted a small bag that didn't look like a camera bag that I could fit a full frame mirrorless in and a spare lens for walk around type street photography. I can fit my Nikon Z7ii or Sony A9 with either an 85mm f1.8 or a 35mm f1.8 attached, and the other secured nicely in the bag's main compartment with a spare battery, and other little bits in the pocket (filters, cleaning cloth, pocket knife, etc.)
The velcro that secures the flap is pretty strong and I don't like to fully block it off with the little covers so I block it off only about halfway. I have occasionally left the flap fully open with a lens still stuffed in there while shooting and walking around and I got worried that the lens might tumble out, but the manner in which the dividers were oriented coupled with the slightly tighter opening actually held it in there quite well (although I don't think I will make a habit of doing this). The tighter opening also makes it a bit fiddly to retrieve and insert the camera itself with the lens facing down but I don't find it annoyingly so and I appreciate the extra security preventing an accidental spill.
I like that there is a rain cover included but I haven't figured out how to access my gear easily when it is on - maybe I need to look this up? I think the shoulder strap and handle are nice features but there are times I wish I could easily remove the shoulder strap. Otherwise I like this bag so much I am thinking of getting a slightly larger one to use with my longer lenses.