Shift Your Mind With Mind Shift
That accepted, the bag that I looked at - the 20 Ltr Firstlight - seems to be an ideal size for the adventurous. In particular for the people who have advanced past the single camera in a bum bag stage...but who do not want to go to the extent of taking two-oxen and a cart everywhere.
People who wish to populate it with mirror-less outfits of any make will have no restrictions - there are lens pockets and body spaces galore. You could take a whole studio there.
There is even an illustration packed with it that puts a 200-400mm tele-zoom lens down the centre channel.
Ample water bottle/ tripod/ pack of Chewies storage on the outside.
A good bag at a good price for the pro walker, and quietly styled so as not to make you look awkward as you go. Always good to look comfortable.
See online or shop in-store, 230 Stirling St, Perth.