I love the green variant of this bag. Looked like canvas from afar. The bottle holder is used as a quick drop-in-and-out kind of pocket, as I dont usually carry bottles or umbrellas. So it works well as there are no zippers. Ie. at a store and easily slips receipts into the bottle pocket without having to unzip any pockets.
I also appreciate the back pocket that has a folding lip (at the opening) so even if I dont zip up that pocket, things will not easily fall out from it. I use it mainly to hold my phone, which I can feel when it vibrates as its close to my body.
Have no qualms with the storage size of the main compartment, as again, since I dont use the bottle pocket to store large bottles, I find the 2L just right as an EDC, while the 4L is simply too large and bordering on using a messenger bag instead.
How can this bag be improved? I guess some magnetic closure for the front or rear pocket, would be awesome since I don't always want to use zippers for easy access to frequently used items (like my phone). and the key attachment string could use some slimming down. The magnetic clip is too large and bulky. takes up unnecessary weight and space.