a little while ago I was toying with making my own. Mainly because I found I couldnt win, the camelback I had was too small for a laptop but the laptop rucksacks are too big. I would sometimes cycle only one way with the laptop and then need to leave it at work… so didnt cycle home with it. What I concieved was a laptop rucksack that had ‘concertina’ sides that you could fold up and shrink the bag back to a smaller size and then expand when needed. Never got around to it but did find somebody who could possibly prototype it but never went ahead, my wedding kind of got in the way. lol.
<scratches chin.. maybe should do it again, any takers?>