I agree with everything said. I ran a 3000 ultra on the icon pro suspension and loved it. 4 days was really pushing it though and when I bought the 3000 bag and sold the 5200 I thought I could squeeze 5 days out of it and I wished I had the 6000 instead, but the 3000 was perfect for my normal day pack stuff. I did end up giving the pack to my girlfriend as she was running a 1800 ultra and it wasn't nearly enough for an elk hunt we had coming up, but I had no issues with it.