I bought the filter bag, on the one hand, to have all the filters at hand more quickly and not have to search, and on the other hand, to save space. The bag is of high quality and fits perfectly for 100x100mm filters. A total of three (theoretically four) different filters can be stowed in it. So it is perfect for a standard ND filter set (8,64,1000). The inside of the bag is completely covered with microfiber so that the filters can be transported in it without any further protection. As a smart feature, it has a pull-out mechanism. This means that if you open the bag and pull the tab, all filters are highlighted offset so that you can grab them much better and read the name directly. At the same time I bought another glass filter - ND64. Since I already have an ND8 from another brand as well as the ND1000 from K&F, this was of course still missing in the series. Overall, I am very satisfied with the quality of K&F. The filters (2020 update) have almost no color cast any more. In certain light situations my ND64 filter goes slightly into the green. However, this can be corrected without any major problems during image processing. The shape of the filter (no round filter) also means that there are no problems with vignetting or falling sharpness. The images are therefore almost unaffected in terms of image quality. The workmanship is great (no sharp edges, stains, etc.) and the price speaks for itself. The filters (2020 update) have almost no color cast any more. In certain light situations my ND64 filter goes slightly into the green. However, this can be corrected without any major problems during image processing. The shape of the filter (no round filter) also means that there are no problems with vignetting or falling sharpness. The images are therefore almost unaffected in terms of image quality. The workmanship is great (no sharp edges, stains, etc.) and the price speaks for itself. The filters (2020 update) have almost no color cast any more. In certain light situations my ND64 filter goes slightly into the green. However, this can be corrected without any major problems during image processing. The shape of the filter (no round filter) also means that there are no problems with vignetting or falling sharpness. The images are therefore almost unaffected in terms of image quality. The workmanship is great (no sharp edges, stains, etc.) and the price speaks for itself. The images are therefore almost unaffected in terms of image quality. The workmanship is great (no sharp edges, stains, etc.) and the price speaks for itself. The images are therefore almost unaffected in terms of image quality. The workmanship is great (no sharp edges, stains, etc.) and the price speaks for itself.