Digital BW, The Print

I'm at the point where I need storage boxes.  There was a post here 
that Lightimpressions catalog now has boxes for 13x19 and 8.5x11.  
(Adorama also has these and 11x17).  The catalog on p. 51 (Aug) 
describes two kinds of paper and tissue.  These are buffered and non-
buffered.  Which kind would be appropriate for these carbon pigment 
prints?  I use MIS VM, but it seems all the MIS and Piezo inks would 
be similar in their handling requirements.

Andy Unger