I personally have the WANDRD PRVKE 21L, I really like it. The camera bag can be removed as well and there is an external water bottle holder as well as quick camera access. The roll-top is very useful to increase its capacity. My only gripe is that the top compartment lacks pockets to organize my stuff, but I guess I should buy zipper pouches.
I have been looking at the wandrd prvke, both the 21 and the 31 L versions, but my concern is that even the essential camera cube takes up to much space for my needs.
All I need is my camera with 1 lens attached, 2 lenses and a couple of filters really. I would like to have the rest of the bag be for clothes or whatever I'd like to pack with me for a weekend trip.
What is your experience on this? Does the roll top expand the capacity a lot? How does it look when fully rolled out and packed to capacity? What have you managed to fit in it when packing it to its capacity?
I use the standard cube (there is a large one) and I usually pack either
my A7IV with a 24-105 attached to it + a Tamron 16-28 + a prime
or body + 24-105 + 3 primes
or body + 24-105 + 1st gen Sony 70-200 f/2.8 (I can't remember if I managed to pack a prime as well)
There is no dedicated pockets for the filters but I usually carry them in the "tablet" pocket that I never use.
Then I fill the top half of the bag with a couple of t-shirts, underwear, chargers, cables, sunscreen, glasses, headphones and hat, usually the roll top is expanded 3/4 of the way with a little more headroom.
As for pictures of the bag, I'm not home right now, I'll try to remember to snap some and send them here.
Seconded, I have the same bag and love it. I added a wandrd tech bag and accessory straps and it works great for an overnight, day trip, or light hiking bag with a bunch of photo gear.