Please be aware that when you say "traditional packs are for people carrying heavy loads", it depends on the size of the person too. I am small (around 50 kilos, narrow shoulders), so the situation is not the same for me as for a big man. Even a light pack is a substantial proportion of my bodyweight and I cannot comfortably carry much weight at all on my shoulders. I tried ultralight packs and it was miserable. A few years ago I switched to a Fjällräven Abisko 65, which is a heavy tank of a rucksack, and never looked back. Having the weight effectively transferred to my hips makes SUCH a difference. With this one, I can comfortably carry 17 kilos all day, whereas before, I struggled with 7 kilos.