Shipping Large Sheets And Multiples - Help

My persistence has finally paid off!
For years my friends and family have known that I am an avid stamp collector. I have constantly reminded them that if they run across any collections or stamp related material to let me know.
Last week a neighbor contacted me and asked if I might be interested in looking at a "bin full of stamps" that his buddy was selling. What I found was a storage tub full of U.S. sheets, plate blocks & multiples from the 1920's, 30's and 40's. There is also some more modern face blocks and multiples. The sheets are in file folders & the plate blocks are mounted (hinged) in albums. Also found a nice South American collection, a bunch of Cuba, a small stock book with U.S. & foreign singles and three file folders of Christmass seals (sheets). I should mention that there is some water/moisture damage to about 1/3 of the sheets.

Needless to say I purchased the whole lot!

Now my question: I am going to be listing and selling most of the undamaged sheets - I have no experience in shipping large sheets and multiples. What types of packing material should I purchase to do so? Specifically size/type of mailers, sheet protectors, etc.

Any thoughts are suggestions are much appreciated - Harry

I sell full panes on ebay and always ship with a firm plastic sheet - the sort used for election campaign signs. Such are super firm and light. A pane without separations, creases or folks is very desirable. With - not so much. I sometimes also use light plastic sheets or sheets of printer paper as protectors.

For those who may not be familiar with the most recent trends in North American electioneering, I interpret CanadaStamp to be referring to corrugated plastic sheeting that is being used by a variety of shippers as a stiffener for mailing. It looks very much like corrugated cardboard, about the same thickness but made of plastic and thus more durable than cardboard.

Correct me, CS, if I have misunderstood you.