Choice of 47 or 56L top box

Hi, I am thinking to add a Givi (or Shad) 47 or 56L top box to my VFR 800 (6th Gen 2007 model).
Has anyone got either of these fitted and can you comment:
1. have you been able to fit two full faced helmets in the 47L? (I have done in this in one 47L box in a shop, but it was pretty tight, wondering how well different helmets will fit)
2. Does the 56L look super-big (especially in width) on the bike?
3. Any suggested alternatives (hard cases not bags)
thanks!

 

I have no problem fitting two full face helmets in my 6th Gen OEM 45 litre top box. However I have often considered finding a smaller box for normal use as the 45litre box acts like a sail in windy conditions. If you are stowing two XXL helmets then perhaps the bigger box is needed but I found that once you worked out how to orientate helmets so they best fit inside they will leave room for a jacket, gloves and GPS to be tucked inside.