I'm carrying the OEM donut spare. It takes up some space, but the e90 is not my only vehicle. Big cargo jobs are left to the XC70 or Sienna. Details about the spare can be found in this thread from the other forum:
http://www.bimmerfest.com/forums/sho...d.php?t=297373
__________________
'13 335is convertible (manual)
'11 X3 xdrive35i
'15 Sienna Limited AWD (road tripper)
'06 330i MT, sport,premium (retired)