CBF, I went over to hamilton today, called in to the Base, the Kathmandu there, and got me one of those too....awesome! Now you are being penalised for having a light rod tube (if there is no difference in charges between a 5kg rod tube and a 23kg bag), then sod it, I will use the bag to take more stuff! ;-)
Excellent looking bag too, for $60, well worth it.
cheers, thanks for the tip-off,
Stu.