The art porfolios like the one you mentioned are 
the best way to go.  Actually as those go, that 
is a really cheap one.  Typically a good one will 
run from $150-$300.  

While it's always good to save a buck, some 
things aren't worth cutting corners.  Of my 
friends that bought cheap art portfolios, all 
regreted it and wished they'd spent the extra $50 
or so to get a decent one.  I wrote up a little 
thing on that on my webpage:

http://miyu.dynip.com/~hinoto/storage.html

I'm still in the process of finishing the other 
sections, but the one on books and storage is 
done, it should answer some questions and explain 
why cheap ones cause problems.

Cheers,
Brian