This is a list of book suggested by a photographer I meet and learn a lot from
Thanks Julian Gaviria:
Peak design Capture-pro camera clip
I've left my camera at home many times cause I don't feel like caring the whole thing. The strap is not the most comfortable choice when biking or hiking. This clip changes all. Easy to use and just right to the point.
This is a great product. Great balance of engineering, practical approach, design based on the customer, good performance, and last but not least, great quality. I would buy it again, they have lifetime warranty though.