Any question answered...

i like the thrifty style, but that's surely not gonna keep the water from getting through into my laptop when it's raining hard though. does anybody dare own up to having a hump one? if so, how is it?

No experience of Humps but if it's waterproofing you need just buy a cheap dry sack from a camping shop and stick that in your rucksack (you can go full on rubber but they are bulky or you can get one of the thinner more 'nylon' ones). I get the impression the Hump covers are all about visability rather than protection from water.