I just took delivery of my 2004 Mobius LSV. The front locker sack is 400#. The stock side sacs are 250# each. I just ordered custom sized/colored sacs for both my rear lockers from www.boardersparadise.com, which are actually made by www.bigwake.com. After measuring the rear lockers, I went with sacs 44x24x18. Which, by my calc, totals out to 687# each. Hopefully this should be perfect for surfing, but we'll probably only fill half way when wakeboarding. 687+687+400=1774, I think that may be too much weight if all full, but we'll see when I actually get them.