I would be interested in what anyone has to say about the flip lines I produce. You can view them at VelvetRun
and note that this years models will have a new carabiner... it is going to have an Omega Keylock Locking carabiner so there is no "tooth" to hook on and the bag will slide off the carabiner easier. I have run these down the upper gauley and six mile without ever having the webbing come out of the bag. I've used them a lot in classes and found them to be easy to use. Let me know what you think.