the cargo space in my E61 was indeed bigger then the E70, but who cares
I just tell my wife to pack less...
but with our second son on its way, we have an Audi A4 Avant on order for the misses when we go on the move with 2 small kids and all their shabang... We first looked at the X1 but that's a big nono all the way: average cargo space, no way to put the baby-carrier in the back-seat (seatbelt too short) and very little space in the front for the passenger...)