Digital BW, The Print

What's the best way to ship 13x19 Silver Rag prints?  With my silver 
prints, which were never larger than 11x14, I'd ship them with a cover 
sheet of acid free paper inside a polyethylene sleeve.  This would be 
sandwiched between 4 sheets of  cardboard and the edges taped.  Would 
using tubes be the best way to go?  If so, does anyone have any 
suggestions as to a brand, size, or supplier? I'm guessing that I should 
line the tube with archival paper.  Place another such sheet on the 
print and then gently roll this into a tube.  I'd appreciate any advice.

-Peter De Smidt