In reply to euan maharg:
If you are thinking of the import costs of a US pack, it might be worth holding your horses until Black Friday. From memory, Hyperlite often do a 20% off deal which cancels out the import duty.
I'm sure I'll get some downvotes for suggesting it as well but I have had some success with asking US cottage industry to mark items at a lower value or as a gift to make the duty less brutal.
I got the Southwest in the thicker material and it really is the best backpack I've ever used. I came across a few on the Appalachian Trail and everyone loved them (one chap was on the last of his triple crown, so his pack had done upwards of 5000 miles). As soon as I finished with my dodgy 90s Karimor pack I picked one up.