Excellent racking biner. - Black Diamond Miniwire Carabiner

I go between these and Nano 22. They are both super lightweight and useful as a racking biner. They have a very different feel since they have a more textured coating than most carabiners. This helps with grip a bit and adds a feeling of quality (doesn't actually affect strength). The notch does snag a bit, especially coming off my harness, but it's the price you pay for such a cheap and lightweight biner.