The roll top does expand nicely and fits quite a bit of stuff. The aesthetics of a filled roll top isn’t great, but I’m not the most stylish person, so take that with a grain of salt.
I’ve mostly packed a jacket, beanie, some snacks. Nothing too much.
If all you have is one camera and two lenses, you might consider just getting a camera insert that you can throw into any bag. It’d be way cheaper. I have a few from Tenba and they’re quite nice.
the prvke smaller camera cube does not look that big… I don’t think you’re going to find a bag with side access where the cube is significantly smaller than the one in the prvke.
Put the bag at the top?
Or get one of those holster style cases for the camera, so its outside of your main bag, and just put the lenses in some protective thing.