In the first photo the first three bags from left to right are all Osprey 26+6 bags in Tumbleweed Yellow, Tunnel Vision Grey, and Black.  The fourth bag is the Almond Oak bag.  I took the picture in the best daylight (daylite!) I could manage.  The second photo focused on just the black and grey Osprey 26+6 bags so anyone considering those two can get a closer look at the differences as they very similar, much closer in color than I expected.  The third photo is the interior of the Grey and Black Osprey bags, where you can see that the grey bag has a cool grey interior color, and the black bag has more of a warm grey interior color.  The fourth photo is the interior of the Almond Oak bag which is crossing into more of a beige color than a warm grey.  I didn't take a photo but the Tumbleweed Yellow Osprey bag has the same interior color as the Black bag when I look at the two of them side by side.

In addition to these three 26+6 bags I have seen the "Kakio Pink/Purple Ink" one in person as well as my girlfriend uses that bag.  For what it is worth I think that bag looks great in person, unfortunately she is currently traveling with it so I could not grab it for a comparison shot.  I haven't talked much about the Tumbleweed Yellow because I think it is terrible.  Maybe without the teal zippers it would be tolerable but this color is just not for me.  Despite wanting a more colorful backpack, I do want those colors to make sense.

Currently I use the Matador EDX Lite backpack for my travels, and it is pretty good mostly because of its weight, but I do need a little bit more space and I have been trying to decide which of these bags to use.  Really, I just wish there was a backpack made similarly to the Matador EDX Lite that was in the 26-30L range.  The closest thing seems like maybe the ULA Dragonfly 30L and maybe if I sell all these bags I will just buy a Dragonfly.

This isn't a real review because I have not actually used any of these to travel with yet but I will compare my current thoughts on the Osprey 26+6 and the Almond Oak 25+5 after playing around with them in case anyone is interested.

Where the Osprey is better in my opinion:

* Attachment points on the front
* Attachment points on the straps
* Two water bottle pockets
* Key Clip

Where the Almond Oak is better in my opinion:

* Separate laptop compartment (really great for me but maybe not everyone)
* I prefer the front pocket on the Almond Oak to the two front pockets on the Osprey, but its a pretty small overall difference.
* I prefer the inner lid pocket on the Almond Oak.  This pocket just feels more practical than the one on the Osprey for some reason even though they are very similar.
* I like the feel of both the interior and exterior materials on the Almond Oak more, though not sure how well it would hold up over time compared to the Osprey.
* The bag looks better.

  
Some negatives about the Almond Oak (in my opinion):

* It has a hidden passport/wallet pocket and I personally just find those to be useless.  I keep my passport on my person and I don't love the idea of putting literally everything important into the bag so that if it gets snatched, lost, or stolen I now have nothing.  I would much rather have had another water bottle pocket, though it seems like it could have been possible to even do both, and in that case it wouldn't be a negative for me just a thing I don't use.
* Not having attachment points on the front feels really frustrating.  On my Mini MLC, my matador, and my girlfriend's 26+6 I use those to attach a paracord which is great for jamming a jacket into, and also just to help differentiate your generic black bag from every other generic black bag so you can easily spot it when necessary.  I can live without attachment points on the straps but those would also be nice.
* I would like a key clip in here.  When you are traveling for months having the key clip is great because you never have to worry about your keys getting moved around in your bag.
* Mine has a lot of strings hanging about that need to be clipped, it just feels a bit more rushed than the other backpacks in how it was assembled and it makes me worry a bit about how well it will hold together.

Some negatives about the Osprey (in my opinion):

* Every one I have seen either just looks super generic or ugly, with the exception of the red one my girlfriend uses.  I have not seen the "Nightshift Blue" or "Blue Spikemoss" colors in person though.
* Laptop is annoying to get in and out when the bag is packed pretty full due to it not being a separate compartment.

Some general comments about both:

* Locking the zippers to the main compartment and front pockets is possible using two locks on both bags, though in different configurations.  I do not see a way to lock the hidden pocket on the Almond Oak however, but since I don't use it that isn't really a negative for me.
* I wish the water bottle pockets on both were a little bit bigger so I could put my sandals in them.

A little about my use case, I travel and work, I have to carry a rather heavy work setup that can't really be optimized beyond what I already have, so I have been focused on keeping everything else as light as possible to deal with 7kg limits.  In reality I am hovering around 10kg most of the time but I just shove some of the heavy stuff in my pockets if necessary.

Overall I am leaning against the Almond Oak because of the missing attachment points for putting a paracord on it and the single water bottle pocket but other than that I actually prefer it, especially the dedicated laptop sleeve.  I feel like what you lose with the Almond Oak isn't worth the small amount of weight that you gain compared to the 26+6.  But I have not taken either bag on a trip myself yet so take that with a grain of salt.

Osprey 26+6 and Almond Oak color comparison