everybody builds a version of these and I wouldn't pay over $20 for ANY of them! I've used them for years and they are on every pair of binos that I, my buds and sons use. (Except a pair of Zeiss compacts I use turkey hunting and during bowseason, the original "shoelace" strap works fine as I keep them in my shirtpocket anyway).

http://www.amazon.com/Allen-Company-.../dp/B000RWNEVS