I already have a photographer's backpack, which is quite huge, and a smaller sling bag. I was wondering if I needed this crossbody sling bag, but in the end I'm glad I decided to order it.

K&F Concept is a known brand to me. I have quite a few of their photographic items, all very decent quality. It was one of the reasons I decided to order this bag.
The other one was the fact that it doesn't look overly flashy. If I'm carrying some fairly expensive gear, I don't necessarily want everyone to know that. The bag is quite simple looking, but still aesthetic.
Finally the third reason was that it didn't look overly large, despite being quite spacious inside. Size of carry bags is quite an open subject in photography. What's huge for one person will be too small for another. In my case I like to pack light and I normally know what gear I need with me, so I prefer small to medium sized bags.
The main advantage of a sling bag over a backpack is of course that you don't have to take it off to access stuff inside. With this bag I like that the main compartment is accessible from the top instead of having to open a messenger bag style flap and risk some of your gear falling out. You can unzip it slightly to just get the main items, or more to get to various smaller pockets. It has got quite a few, some further zipped and some open.
The inside has a velcro-style split system, which can be freely customized and adjusted. It has got plenty of padding for protection against one gear hitting another.
There is also a separate, flat tablet/small laptop compartment, as well as some side pockets for drinking bottles or mini tripods etc.
Finally you have the straps running over the front of the bag and underneath it. I didn't look at the pictures initially and kept wondering what purpose they serve. And I figured it out myself that it must be for a larger tripod. Quite handy as it won't fit inside the bag (my backpack takes the advantage here) and it's not blocking access to inside, but it's losing the ability to put the bag down safely, unless you remove the tripod first. Small issue I guess. The positive is both straps have locks, so they don't loosen up on their own.
The materials are very good. The whole bag is water repellent so your gear is safe from rain. The bottom is anti-slip and has plenty of padding. And the strap is good quality and has a very comfortable, adjustable padded area. It's not detachable though, which is a minus for me. There's also a decent handle on the top backside of the bag. Pretty useful.

Overall I like this bag. It's well designed, looks good and has quality materials used. It's comfortable to wear and you can access all contents ‘on the go'. £60 is not cheap, but also not expensive for a photographer's bag, with some costing hundreds of pounds. Happy to have it and definitely happy to recommend it.

Thank you for reading my review. I hope you found it helpful.