New TopBox, too big?

[darrsi]

People are right about the weight limits though, don't just go lumping half your house into it because there's always the small chance that over time a series of speed bumps or the like can cause an incident, and i've been there with a sports rack which simply split in half and the box overtook me when i was slowing down.
The actual reason they're that big is primarily to fit 2 crash helmets in when parked up.