Any question answered...

I know they are the target of anti-nodder ridicule, but does anybody know if the Hump rucksack covers actually a good or bad bit of kit? Seems like a decent way of adding waterproofness to a rucksack without having to buy a proper messenger bag, which are not cheap at all.

My karrimor rucksack came with a rain cover that seems like a simpler version of the hump (plain black). It probably wouldn't stand up to hours of persistent downpour as the rain could still seep down your back or along the straps and slowly soak the bag, but i've found it works pretty well for keeping things dry when cycling in the rain.

The advantage over putting waterproofing inside is that you don't arrive with a soggy rucksack.