How does it compare for use as a bear bag line? I have no idea. The specs for the Zing-It are here.
The 1.75mm is a little lighter .96oz vs 1.25oz for Dynaglide. Its breaking strength is less than half. However, if you are hoisting 1000 lbs of food in your bear bag then we need to talk.
I read on some arborist forums and some swear by Zing-It, others by Fling-It and others Dynaglide. It seemed the majority that had tried Zing-It and Dynaglide liked Dynaglide better, but that wasn't a scientific comparison, and it was by arborist that were using it for a different purpose.