Dip belts work well with kettlebells. I'm not 100% certain how the one in your link holds weight, this amazon listing is a more conventional design, and one photo even features a kettlebell. I think the one in your link is probably basically the same. I think the wide part wraps around the entire body, and the kettlebell would hang from the narrower nylon strap. Most have chain instead of nylon, but the round handle of a kettlebell would fray the nylon less than the squarish edge of a weight plate.