There's a lengthy discussion on the product on the Hammocks Forum. Also, Arrowhead Equipment is a distributor of the Roller Pack & Ski. No difference in the price but he also sells other camping and hammock gear so you can add other items that you might want or need and save on shipping/handling charges from separate vendors. I have no affiliate with Arrowhead except I've bought my KAQ underquilt and other products from Paul. His workmanship is tops and is only exceeded by his customer service.

BTW, Paul uses the roller Pack and has been in conversation with the comany on making some modifications. (Hammock folks are always into making mods!) I'm sure Paul will be happy to honestly answer any questions you have about the product.

BTW II, I digress but I recently picked up his Super Dinner Bivy for freezer bag cooking. I haven't tested mine yet but Paul's tests show it retains heat for rehydration for a very long time.