I am happy with my Tenba Fulton v2, (14l, medium size), the carmouflage edition, I showed in this thread last year.
But I only use it in 2 different scenarios. Either when I am with my bicycle in the city for something else or when I do city trips and have to carry more than 1 camera with attached lens all day long and need some space for water bottle etc. too. This is not a bag to be able to have fast access to everything,
Since 2024, in most cases I prefer to carry only one camera with attached lens on a peak design strap over my shoulder. Depending on the camera/lens combination, I use the slide, slide light or leash. No bag at all.
Thanks to this, I can shoot faster (movement like a sling bag but without the bag). No weight at all and I do not "feel" the camera since it is on the side. Even a S5II with 100-400 is easy to carry with this. Here is a video about it:
The downside is, that you can see always the camera and the camera/lens is not protected.
Apart of that, I still use my beloved Billingham Hadley small pro shoulder bags. I have 3 of them in different colors (black & beige), because I store my cameras also in it, when I am not using them. If I need small and light plus protection, the Billingham Hadley small pro is my choice. Fits perfect on a Trolley, when you fly with cabine bags only.
But even on trips with the Billingham Hadley small pro, I put the Peak Design straps 90% of the time on the camera and leave the Billingham bag in the hotel.