Rucksacks

I would like to ask your advice, O wise and experienced people of LJ!

At the moment, I have a rather good satchel-style Targus laptop bag, with many useful pockets, that I use to organise and carry around Lots Of Things. It also functions, just about, for a weekend away. For larger needs, I have (what I'm fairly sure is) a 1972 pattern GS Bergen, which is to say a large green army surplus thing of more or less infinite capacity and more or less infinite lack of ergonomics.

I would like to replace both of these with a single smaller rucksack (for lack-of-back-and-shoulder-pain purposes), which should fulfill as many as possible of the following requirements.
( longish )

From secret worlds above

Now that's a grand big storm out there. The Welsh idiom is bwrw hen wragydd a ffyn - raining old women and sticks.