I already have an S19 - in original Nordic, lined with Steel. I used it extensively as a gym/yoga bag for quite some time, and for day trips to the office. But it's marginal for anything more - I'm 6'2" and 17.5 stone, so the S19 is - ahem - significantly undersized for my packing requirements for e.g. overnight stays. I'm hoping the S25 might work better for someone of more robust dimension...