I used to be great at throwing a bear bag line. My trick was that instead of throwing the rock sack like a ball, I threw it like a grenade. Worked fabulously nearly every time.

But then, for reasons that remain unclear to me, I lost my 'touch'. I was on a trip with a number of friends in the Trinity Alps, and went to hang my bag. After numerous, and I mean numerous, attempts at getting the rock sack over my designated branch, and much loud profanity, and, of course, much smirking and laughter among my hiking mates, I finally got a decent hang. Then I laughed heartily at myself.

I've used an Ursack ever since.