Hi Paul,
Annoyingly, I've no way of weighing it here (if you saw the size of me, you'd know why) but I seem to recall it being around 9lbs when listed on the BassDirect site - it certainly isn't a back-breaker and I wore it for three hours last night at a rehearsal and was perfectly comfortable.
I can try and borrow some bathroom scales if you'd like? Just shout.
Cheers,
James