This is an honest opinion based on my experience.
The photos, data, and description provided by the seller are accurate.

This set of cases from K&F Concept has pleasantly surprised me, especially because, although designed for lenses, they end up being useful for much more. I've used them on trips to carry everything from camera lenses to cables, hard drives, chargers, and even a Bluetooth speaker. And everything has been perfectly protected. They are padded but not rigid bags, which means you can organize them neatly in any backpack without them taking up too much space.

The sizes are quite good. There's a small one, which is big enough for things like batteries, SD cards, or a pancake lens, and a larger one that can even fit a telephoto lens or any bulkier accessory. Each bag has its own closure system with a drawstring and a hook to attach it to a backpack or belt. The latter is well thought out, but for heavy equipment, hanging it like this doesn't inspire much confidence, at least not if you're going to be moving around a lot.

The interior padding is just thick enough to protect against minor bumps and prevent scratches, but it's not a rigid case or designed for serious drops. If you use them as a mid-layer inside a backpack, they do the job perfectly. They also help keep everything clean and organized, as the outer fabric repels dust quite well.

One interesting detail I liked is that the cases nest inside each other like Russian nesting dolls, so you can store them all together when you're not using them. I also found the design understated yet pleasing, with that triangular texture that adds an aesthetic touch without being over the top.

The only thing I miss is that, depending on the lens you're using, the lens hood might not fit with it, especially with full-frame wide-angle lenses that have wider hoods. In those cases, you either have to forget about the lens hood or find another way to carry it. But if you use more standard lenses, or even APS-C, there's no major problem.

I liked the whole package, both for its functionality and its versatility in adapting to different uses. It's a simple but well-designed system, with decent materials, good stitching, and padding that, while not excessive, provides effective protection. If you need something lightweight that doesn't take up much space and gives you a sense of security for transporting lenses or electronic accessories, these cases do the job very well. I'll definitely continue using them and I wholeheartedly recommend them. You won't regret it because their greatest strength is their versatility.