Mostly good design, best I know of.
I like it better than most designs.
The straps could be improved, the design of the straps restricts the location the lower straps cross in the back too much.
My opinion is a sliding plastic clip connecting two straps at ~ 90 degrees would work better than the design you have. My somewhat educated opinion as a design mechanical engineer.
Reviewed by: Alfred Montestruc from Houston.