This K&F Concept 18L camera backpack is £59.99 at the time of this review. I have an older K&F backpack I bought in 2017, so I'm comparing this a bit to that. My older backpack is still in excellent condition after years of use (side by side in final picture)

On the outside, the materials seem robust and I'm sure that it'll hold up. On left side of the backpack a tripod can be attached. The right side is blank, a missed opportunity to place a net there for a bottle etc (which my older K&F backpack has)

There is no padding on the rear of the backpack. It's not a deal breaker, but again the older backpack had it, so a missed opportunity for comfort. It's a similar story with the straps, which have minimal padding. Wearing the backpack is fine. There is enough length in the straps for a good fit and it can be fastened across the chest.

Inside the main compartment it's 100% gear space. The main 2 dividers are stronger than my older bag, so nice to see some improvements in this area. the smaller velcro divides can be placed as necessary. There is enough space in the bag to have my full frame DLSR with a 24-120mm lens attached and a 70-200mm lens beneath it. I've also put a 50mm prime and flash in with a few other bits including the provided rain cover. Overall I'm happy with the storage space for my needs.

In summary I'd say this is a good decent size backpack for someone with similar needs to me (largish camera with a few lens) with room for a few improvements to future versions.