My 5 y/o Frank Thomas rucksack is starting to disintegrate at an exponential rate, so I need a replacement quickly (amazing it lasted that long I suppose, given the usual comments about Frank's workmanship). I'm usually only carrying a laptop, phone, wallet etc., so I don't want anything too big so the contents will just rattle around. But I occasionally use it for overnight trips when it needs to hold a bit more stuff. One nice feature of my current one is that it's got a zip that you undo to let the thing expand when you need more capacity. Anyone have any recommendations ? Thanks