Just got back from a trip into the backcountry using an older model Icon 5000. All I can say is... ouch! The pack felt like it has a brick for a lumbar pad! I've been backpacking for years with several different packs and this is the first time I've experienced so much discomfort in this area. Of course there's alway's a small amount of discomfort with a lot of weight in a pack but nothing like this. It felt like it was both chaffing my lower back and also bruising it. The pain was extremely irritating. A couple days later I can still feel the soreness if I touch my lower back right above my crack. I tried loosening the waist belt, tightening it, loosening the shoulder straps and over tightening them but nothing worked. Anyone have this problem and is there a fix, or do I just need to get a pack that fits me better? Thanks...