When I load up my GoLite Jam, I do as I was taught, using my foam pad as a virtual frame, and stuff the rest of my gear down inside of this. I cut down a blue foam pad to get something torso length (my full length Ridge Rest just didn't work inside the pack). Unfortunately, I now get this weird feeling with the pad pressing into my back from the curve of the pad. Frankly, I'm not sure I like it.
Now, admittedly, this is worse when I use the sternum strap (which also makes my shoulders hurt, but it's still there. Does anyone else experience it? If so, how do you deal with it?