NZcaver wrote:If you're climbing with a heavy pack (eg multi-day trip, lots of camera gear, rope bags, etc), you will lose efficiency big-time. As you stand up, the bungy will stretch because of the weight of extra equipment hanging off your central screw link. Therefore the Croll will only move up the rope a small amount with every climb stroke. From personal experience, I can assure you this is rather tiresome and frustrating.
Thanks guys for the information. Jason recommends when using the bungee if you are hauling a pack up as well to clip the pack to your leg loop on your harness instead of the screw link. He has hauled as much as 40lbs this way and it works much better (for him).