The MBAG90P is padded to protect your equipment and has the following features:
Asymmetric tapered shape allows you to store the tripod with the head attached.
Tripod legs fit comfortably in the narrower end (diameter 20cm - 7.87\") and extra space is allowed for the larger volume of the head at the wider end (diameter 23cm - 9\").
This also means it's easier to put the tripod and head in the bag, even if the head levers and knobs are fitted and jut out slightly.