Results are in!
I have taken my new whoopie slings (7' max length per side) and 5' straps w/ alum. crossbow shaft toggle and weighed them as compared to my previous suspension (WBBB straps, tri rings, carabiner). My new whoopie sling suspension weighs 4.4 OZ for both sides whereas my old suspension weighed in at 11.0 OZ on the same scale.
That is a savings of 6.6 OZ!
Now to see if they function in the field as well for me as I hope...