There are many backpack holders/clips of this type. Simple cheap, almost unusable, up to expensive “original” clamps from manufacturers. For example, I also use the “GoPro” clamp and I'm happy with it. However, there is no other clamp that comes close to this K&F Concept Clip. Everything here is of high quality. The workmanship, the materials and the practical design. The clamps give the impression of solid material, which is reinforced by the confidence-inspiring weight. There are no sharp edges or unsuitable housing parts here. The shape is well thought-out and ergonomic. The joints are stable and almost free of play. For action cams, the clip looks almost oversized. However, this clip is also trusted to use real action and not just influencer selfie montages as is often the case with “action cams” recently. The terminal properties also speak for proven robust suitability for use. The clamping force is very high. Clamped to various scales, an average of 3.5 kg is displayed. As clamping jaws, there are sturdy rubber pads that are interlocked against each other. This not only lasts better, but also protects sensitive surfaces. (For example, during some missions such as sports or wildlife, I also clip a GoPro onto the front of my 200-600 mm telephoto lens. With this clamp, this is gentle and very safe. When connected to the diffuser, there are no visual obstructions). As a result of this type, the clamp also holds firmly on smooth straps. On many other objects too, of course... When opened in parallel, the rubber pads have a gap of 5 mm. It is also possible to clamp on very thin materials or up to approx. 30 mm thick. The, apparently two round magnets, are mounted under a soft rubber surface. The magnetic force is not very great. Sufficient for immovable use, definitely not suitable for vehicles, etc. The quick-release clamp can be removed from the clip very quickly and easily, which can be very helpful and practical, especially for transport. It snaps easily and securely into the clip. Not only does the option of tilt adjustment contribute to practical use, but also the 180° turning function. For me, the quick-release clamp can move just under a millimeter in the insertion direction after snapping, but does not (yet) wobble. It also gives the (visual) impression that it cannot be fully inserted. It also does not close flush with the outer edge, but it snaps well. In comparison and after extensive use, a clear recommendation for what is obviously the best clamp of this type on the market at the moment.