I've needed a new camera backpack for some time. So I decided to order four different bags (three from K&F and one from Mosiso) to try out, the idea being that I would keep the best one. This bag...is the one that I kept. This is also the most expensive of the four (you get what you pay for)...but I was able to get a good sale price on it.For starters, this bag is very...VERY well made. It put the other three bags that I tested to shame. It's solid, holds it's own shape and is very well padded. Your gear will be safe in here.There are flexibility features all over this bag. The divider between the top and bottom sections can be manipulated up or down...or partially up or down. I am able to push part of the divider up, which allows me to fit my Sony a1 camera mirrorless body with a 300 2.8 + 2x converter attached! That's not a small feat! Most of these bags are made for street photographers. I am a wildlife photographer so I use long lenses. The versatility of that divider panel is astounding! Well done K&F!!!!The top compartment expands upward for more space if needed. It's a great feature, but it does add two extra zippers to that top opening so you have to push them out of the way when not in use. First-world problems, I know.There is a luggage strap across the back which is a MUST for me, as I travel with my gear a lot. Because this strap runs vertically on the bag, you place the bag sideways on top of your suitcase. Smartly, K&F added a grab strap on the side of the backpack to make this easy to do.This bag opens on both sides. The side "doors" that open are padded and each one includes a zippered inner storage area. So anything that you put in those "side doors" won't rub up against your camera gear. Brilliant!They say that this bag is water proof. I don't know about that but it sure seems like it would be. Included is a full-bag rain cover just in case.This bag is small. I'll say it again. This bag...is small. But it's very well thought out, and maybe has a few features that it doesn't even need ( like tabs that snap over the zipper to prevent theft). I guess this might be great if you are tromping around on the streets of Europe, but as a wildlife photographer, I'm not expecting bears and moose to come and steal my stuff, so I'll likely just cut those off. They are an extra step in entering the bag that I don't need.There is plenty of room for a laptop if you carry one (which I don't). That space can be used for a variety of things.About the only thing I would add to this bag is maybe a flat compartment on the inside of the front lower opening. There is a bit of wasted space there as it is now.I guess worth mentioning also is that at least on my bag, the zippers are working very well.If you are one who doesn't need to haul everything you own plus the kitchen sink, I can't imagine that you will find a better bag for the money than this one.UPDATE:I just took this bag on a trip that required air travel. I fell in love with it even more. It fit under the seats on all four of my planes and I was able to carry everything that I needed in it (as far as tech gear goes). Once at our destination, I left some of my tech gear at the motel (camera battery chargers, etc) which left room in the bag to carry a water bottle (inside the bag), my lunch and and an extra jacket while out on hikes. So this bag doubled as an air travel camera bag, and a hiking backpack. Even fully loaded, the bag was very comfortable to wear. I have a bad back and I barely felt the bag on my body. The bag has proven to be very sturdy and well made and I think it will last for quite some time. It is my favorite travel backpack...a true ten-star travel companion.