So, my MLD Zip is slowly being made and making it's way to my doorstep. I'm trying to decide what sort of system to try out for the suspension. I currently have a 2/3 GG NightLight pad. My original plan was to cut a piece of foam from this pad big enough to make a rectangle that would fill up backside of the pack. The rest of the pad would be stored on the outside of the pack.
Now I'm starting to wonder if just having one sitlite style pad as support is enough to effectively transfer the load to the hips. Does having a cylinder inside help that much more than just a flat rectangle against the back? If so, I have been considering using a GG Thinlite rolled up inside, cutting the NightLite down to Torso-length, and just stowing that on the outside. This setup would also help me sleep better at night I think.
Does the NightLite itself provide enough stiffness to act as a good frame, or does the sleeping pad need to be thicker?
EDIT: I'm not trying to get a MLD Zip specific system, I'd just to like to compare different setups which would work in all frameless packs.