Who started this craze, though... Fjallraven. The North Face and Patagonia weren't far behind but it was Fjallraven's little 'Swedish child' bag that started the movement for the retro bag.
The ones in those photos look hideous but for what it matters I definitely prefer 'old' rucksacks to new ones. The old-school Pod, Karrimor, Lowe Alpine, Macpac and Aiguille sacks are absolutely awesome and I don't think have really been bettered. When looking for a rucksack now I'd probably only look at Aiguille, second hand, or Blue Ice.
Cheers Mole - no I was actually asking as this is not something I've looked into before and was genuinely interested! I do very little on synthetic fabrics. It definitely makes sense though, and that's a good link.
I've been doing a bit of testing of down bags/pillows/etc recently and it highlighted quite how much the masses vary according to temperature/humidity/etc.. A big down bag could easily gain 100-200g in mass just by being in a warm moist environment versus a cold dry one, so I've stopped worrying so much about the manufacturer's weight claims. Having said that, some of the stated weights are clearly miles off, and there's no excuse for something like a rucksack that barely has any regain.
I think you'd struggle to find any Mountain Rescue team or outdoor professional advocating three season boots and microspikes in a lot of UK winter terrain. It does depend what you are doing and where but winter boots are winter boots not just because they can take a crampon: they are warmer, better for kicking steps, more supportive, etc..
Having said that, I fell run without winter boots on so maybe there's a time and a place for everything!