Drove about  3hrs last  night, with  our belongings  for the
next few months in our trunk and in a roof bag on top of our
car. The roof bag is heavy enough to dent the roof in a bit,
but it popped back out afterward, without any complaint.

I like the roof bag. It doubles our cargo space. The car has
a V8  (sorry Earth,) so  there aren't any power  issues even
when the car is fully loaded (or overloaded.) In addition to
adding  more space,  the roof  bag adds  a certain  charm to
driving down the  interstate 40 at 80mph; a  wide variety of
new sounds.

In some winds  (or maybe it's the mood of  the roof bag) the
thing  sounds like  a hail  storm.  I might  have loaded  it
wrong, so  a part of the  bag flaps against the  roof of the
car. I tied the straps up well, so it's not those, but there
is a flap of  the bag that could do it.  Maybe it's the roof
popping in  an out. It sounds  neat, when it's in  that hail
storm mood.

In  other situations  or moods,  it sounds  like occasional
flatulence.  I   don't  mind   this  because  there   is  no
accompanying smell.

In still  other moments,  the roof  bag sounds  like someone
blowing a raspberry[1].  That's fun, but it's  even more fun
that there's a gopherpedia entry for the term.

My  only fleeting  fear is  that the  bag will  fly off  the
vehicle, strewing our clothing across the road in front of a
semi truck.  But it's  only fleeting, from  time-to-time, so
it's not so bad. And, the  thing has never flown off before,
so it must never fly off in the future.

[1] gopher://gopherpedia.com:70/0/Blowing a raspberry