Yes, a document tube or a chart tube. A cheap way to do it would be to get a mailing tube and throw it in your bags. An even cheaper way would be to use a paper towel tube although you might end up folding the papers trying to roll them small enough to get it in the tube.

If you attend trade shows, sometimes the vendors have posters in nice cardboard tubes with plastic end caps. I think I've seen these at Staples and Office Depot as well.