I already have a smaller K&F concept bag that is smaller than this. I recently bought a Nikon 180-600mm lens and wanted a bag that was big enough to accommodate the lens with the camera attached to it - make it easier for me to take pictures quickly whilst being out and about. I browsed on Amazon and this probably came out on top in terms of physical capacity vs price. If you see my attached picture, I can confirm this can accommodate a Nikon Z6 Body + the Nikon 180-600mm (15" total length). It's snug - with a few cm to spare from the top of the bag.

A few obvious things I noticed compared to my smaller K&F bag, it's much lighter and square in shape - maximising the internal capacity. However, I believe the compromise here is that there is less padding around the walls of the bag - I don't think I am confident enough to let this bag drop from above my hip, I don't believe it has enough padding to avoid your gear getting the brunt of a drop hence I have given it 4 stars BUT I guess this bag is designed to be lightweight.

Overall, very light, very well built & robust - just like my old K&F bag so I'm happy to see this brand has continued to produce high quality product at excellent value for money.