I buy my polyester pockets from
http://www.preservationequipment.com/
I specify a 100 microns thickness and exact dimensions of 1207mm x 795mm so that the sleeves, which hold one sheets or quads, will fit into an AO-sized plan chest.
You don't need backing boards.
Mark
Thanks Mark, Looks just the job
Prob won't go as big as you as I don't collect quads.
@Tob, Thank you for the reply buddy, but as stated above I don't want to go down the import route