Another great review, full of comprehensive information. I love watching your videos as you provide a lot of detail, especially the size comparisons and capacity.
I dig the Sling and I'm looking for something smaller when my Aer Day Sling 3 Max is too big, but I feel like the Bellroy offers too little organisation for small items in the main compartment. Two mesh pockets or something like that on the divider would have helped that, I don't want things like chapstick, chewing gum etc just fly around in between my bigger items like a wallet or a powerbank...
The Venture Sling 6L would be the perfect sling if only it had a mechanism for storing a water bottle outside the main body of the bag. Even a simple/strong stretchy loop, strapping, or pocket on the base would do it. At the moment, if you want to carry a decent camera on a day out and other day bits in the bag, having a water bottle in there too is really impractical. Even a small 250ml or 350 ml size one takes up too much room and also would hit your nice camera, like my X100V. If you stick in a small water bottle even vertically, it sticks out the top with the zip not fully done up and looking/feeling awkward. I've bought this sling but the lack of a water bottle solution is a real issue for me and I might send it back unfortunately cause it's superbly made. I wonder if I could sew something on the base myself????? Then I'd have room for everything else inside! mMMM so near THE perfect day bag, but not quite...
One idea I saw was using an A7 memo bottle (flat and pocket sized) can fit in trousers / jacket pocket at a pinch . One person had two A7s one each side of jacket to get volume but also balanced!