It is jumbo and perfect for all the ancillary items, helmets, gaiters, gloves, socks- all the extras!
We call this bag our "car luggage."
And when we get to where we are going? It folds flat and fits under the bed. No tripping over suitcases and bins.
Did I mention that they are water resistant and that you can throw all the muddy, dirty gear in the bag for the trip home?
Because they can be hosed out or wiped down-easily cleaned :)