Cool post, although we sometimes see people asking about their packs - we mostly see people in general asking for advice on packs.
I have a few, but prefer a lightweight during the day (I travel to from an office with clothes, food and laptop - I'm never without a pack hehe) - expandable camelbak that has minor strap for waist but I also have a no name internal frame backpack that I'm changing out this year so it's external frame.
But I must add I really do like my waist support - as I use the one big pack for grocery shopping and that probably 40+ (nothing to traveling people) - the waist support greatly reduces that shoulder strain.