For safe storage of three square filters 100 x 100 mm and a filter holder. The case seems sturdy and looks pretty good.

have already bought several K&F square filters and the results are very good, they are good value for money. ND filters (ND8, ND64 and ND1000) are not noticeably dominant in the photos. The distribution of the 3 colors in the histogram is very similar in terms of direct camera photography, making it tremendously easier to edit photos by not having to eliminate dominants. The purple filter offers a very interesting help for night shots. Removes much of the orange halo/fog that appears in night city photography and provides a good starting point for image editing.

In addition to square filters, I also bought the low-cost magnetic filter holder set. I can only say top. However, I lack the possibility of obtaining ND 8 and ND 64 (magnetic) because only ND 1000 and polarization filters are available. A second glass-filled filter holder is included, which is super durable with adapter ring for a second lens size and yet! fits into the super handy case. For the time being, this low-priced set with magnetic holder is enough for me; for further demands, I will probably switch to another manufacturer's “large” filter holder system (about 400 euros with three ND filters). Which photographer doesn't know this “want to have?” In short: Riko Best's contribution to YT convinced me. Would I recommend it? Yes, anyone who wants to work with grey filters now and then. LG

Among several domestic and foreign companies offering square filters, I decided on this one because it is easy to put on and take off from the lens, it is thin in the front and back, and it comes with a C-PL filter
For C-PL filters, just open the lid and drop in from above. If you make a mistake in front and back, it will not fit.
The square filter has just the right amount of friction and doesn't feel like it's going to fall off.
Almost all metal, except for the four metal adapter rings and C-PL filter, the holder alone weighs 110g.
In terms of design, the overall impression is sophisticated.

actually ordered the wrong case, this is for square filters, I didn't know that, I bought it for my round UV lens filters. Even though it's not the case for my filters they still fit and I can get 4 in this case which protects them from scratches and keeps them all in the same place. It's made out of really high quality leather and has a magnet to keep it closed. There's a belt loop that I'll probably never use, but there's a metal frame for clipping onto your bag that I'll probably use. The material inside is like a suede so it won't damage your glass if rubbed against it. When you open the case, all 4 compartments will open, allowing you to easily remove the filters as well.

up until now, square filter holders from other companies have been expensive, and we have endured with SIOTI holders.
I also had an old K&F holder, but it is difficult to use C-PL.
That's where this product comes in. I bought a set of holder + C-PL + ND1000 for the time being, but it is well thought out. There is no vignetting even at 16mm with the Nikkor16-35mmF4, and there is no annoying color cast.
I'm a little worried about the C-PL's adjustment dial squeaking, but I have no complaints at this price with this content.
After that, I would like to see a frame that can be attached to the existing filters sold on the overseas official site, and a filter case that can hold about 6 to 8 filters with the frame attached.
~Addition~
I purchased a 100x150 frame from the US site of K&F. Existing filters can now be used, and full-scale operation is now possible.

I needed a more travel-friendly set of filters to take with me on my hikes that would be too bulky to use my square filters. Having these filters in its own soft pouch was perfect and didn't take up much room in my camera cube. The magnets were strong as they held while I prepared my composition - sometimes in the rain and on uneven ground.

I needed a more travel-friendly set of filters that I could take with me on my hikes that were too cumbersome to use my square ones. Having these filters in their own soft pouch was perfect and didn't take up much room in my camera cube. The magnets were strong while holding on while I set up my composition - sometimes in the rain and on uneven ground.