We have matching cabin luggage cases. That leaves space for a good size squashy sports bag and our walking boots too. Pressies and stuff acquired on route usually ends up in the passenger foot well. Plenty for a week+ away.
I was in the same position when I had the E85 - I bought two suitcases made by Tripp - they were 410mm wide - the width of the boot space is 820mm - length of the cases left enough space for odds and ends.
Fitted luggage system at low cost and big enough for our three week sojourns around Europe !