Super fast delivery, arrived after just one day. The package was not intact but the contents were, sealed and untampered with.
The backpack is very comfortable for my intended use. I comfortably placed the Nikon D3300 body with 18-105 lens mounted, Sigma 105 macro lens, flash, all accessories (charger, batteries, SD cards, cables, remote control, etc.) and tripod on the outside. Many hidden pockets, including a pocket on the back for a tablet or PC. Not yet field tested, update to follow.
Recommended

I can finally store all my things neatly and in an orderly manner. The layout is well laid out and the quick access to the camera is awesome. Personally, I like being able to store the tripod on the side. The layout of the small compartments for memory cards and batteries is also great.

I decided to buy this backpack to go with the one I currently use which is very roomy.
When I don't need too much equipment it's really ideal, quite comfortable (unfortunately it doesn't have a strap to attach it to the chest).
Let's start from the bottom: in the front area there is a pocket where you can put up to three lenses, while underneath a pocket contains the lining to use when it rains (nobody's stopping you from putting small items like SD cards etc.)
Above there is a compartment where I usually put my filters and cloths to clean the lenses, let's say that as a compartment it's not too big, but as shown in the image you can also fit a telephoto lens if you want.
On one side we find the compartment for the camera (only one) and immediately below a small pocket to insert other small items (SD cards, chargers, etc.)
On the opposite side we find a pocket as long as the backpack to insert documents or a small laptop, two bands to support the tripod and an elastic net that I always use for the tripod (when I don't use it I insert a bottle).
Overall a very good space-saving backpack that I use only and exclusively on one-day photography trips.

Recommended for those like me who have a lot of equipment and usually carry everything, with this backpack you will only carry the essentials!

I personally use this waterproof camera backpack, and I find it really practical for my photo outings. The bag is well designed, with sturdy materials that effectively protect my equipment, even in the rain. The main compartment is spacious and modular, perfect for organizing my camera, lenses and accessories. This bag offers excellent protection and comfort, I recommend it.

This is one serious camera backpack by K&F Concept.

The quality and design are top notch, light, durable, and very stylish. It’s crazy how many things you can fit inside and in a truly organized fashion. You also have so many adjustment options on what to put where, you can get everything at the right place to make it fit, or to balance it out properly so you don’t have all the heavy parts all on one side.

Definitely recommend it, it looks great too.

SLR camera backpack, although I see it more for mirrorless or DSLR cameras, it is not a large size, it has good protection for the cameras as well as many separations. It has a waterproof cover, the backpack is very good, the straps and back are well padded, it has neutral colors, I would like to say that the first one I bought I had to return because it came with the zippers poorly closed and the fabric marked, I got in touch and they solved everything for me. It has hidden pockets, which are good for storing documentation. In terms of the size of the tablet compartment, I have put a 13.3-inch laptop in it, which fits well, without being too tight. I recommend the product and the brand, very attentive.

This backpack is just as advertised. When I saw it, I was surprised by the quality. Also, the fabric looks very good quality. It arrived in a bag without much protection, but the product is in perfect condition.

Perfect bag for carrying mirrorless, I use it to carry my sony a6000.
Waterproof and with a water slide in a pocket that does not take up space.
I can also carry a 55-210 lens, the sony a6000 with the case, ND and CPL filters, remote control, battery and more.
Mine is the S version and despite this it is really large.
Excellently padded and also aesthetically beautiful.
Arrived after 1 day from the order, with its competitive price it is comparable to other more famous ones.
There is also a fairly long shoulder strap that allows for transporting it with ease.
There is not much else to say except good things, RECOMMENDED +++

Finally the right backpack for me! From the photos it seems much bigger, but it didn't disappoint me. It's compact but extremely versatile, comfortable and the weight is distributed very well. It's really well made, waterproof and very well padded and protects all the equipment perfectly. I have an Olympus Om-D Em1 Mark 2 and I managed to put it in the special quick-release side pocket together with the 50-200 mounted. In addition I was able to carry with me in the special pockets the 12-40, the 45mm, 5 filters, flash and batteries and various accessories as well as the remote control and the GoPro. I didn't force anything, everything was in its precise place. The next day instead I put the Olympus equipped with 12-40 in the bottom pocket while in the side I put a Canon 1100D with the 55-250 mounted. And in the upper pocket I put the 50-200 and GoPro always with other useful accessories. It's also very nice to look at. It's worth it.

Another update: here I'll post photos of everything I managed to pack today in my backpack.

Para el tamaño entra 2 cámara un 70 200 w a 3 lentes tarjetas notebook, tripode binoculares, etc etc