So, I tested the Stone Glacier binocular harness all thanksgiving vacation glassing and hiking for bucks. I used 12x50els. It will be bit snug but fully functional on the 12x50 models. Swarovski and Leica! Extremely comfortable! I think 9 oz, lightweight, and is truly a one handed Bino harness. The Best thing I noticed about this harness was that my focus wheel on my alpha Swarovski and Leica’s never got turned! So, never had to readjust after pulling them out on hikes or driving around! Very comfortable, easy to adjust, truely one handed, and can be used on many makes and models! I will be running it on a late December mule deer archery hunt! I’ve had Sitka,kuiu, Alaska guide creations, badlands, etc. I will say it protects about 95% of the 12x50s. There is a small gap from the lid closure and main pouch!