However their rucksack fits my criteria exactly and I've still not seen one that I like the look of as much. (Hence why it's more than a year I've been looking!)
There you are, that's all the justification you need. If you like it, and it fits exactly your criteria, then buy it. I've seen the bags in Howies shop in Bristol, and they're just lovely and I really, really want one. But, I have two courier bags, a Karrimor I got cheap around seven years ago and gets used every day for work, and a lovely huge Timbuktoo bag I also got really cheap that I use for everything else. I can't justify the money, and I have no serious need, so it's just lust after a really nice object, but you can justify it so get it. If you're lucky enough to blag one on a sale day, even better. As it happens, when I was in the shop I was looking at the Tomproof jeans, thinking how much I'd like a pair, when the delightful young lady I was talking to mentioned there was a 20% reduction on all stock for a couple of days…
…they're really good jeans, with that lovely indigo dye smell Levi's 501 shrink-to-fits used to have, and I'm really glad I got them!