Pinecone LOL
Tim,Never had any trouble with seams coming apart on back, but avoid them for hand quilting cause I loathe hand quilting over them. For an unpieced back I usually use super wide calico, comes in widths up to 8' which is pretty wide, pretty reasonable too at around $8 - $10 per metre (compared to $20 for the stuff on the front :lol: ) depending on width. Comes up beautiful after a really hot wash and dry on the line, Quilts like a dream. If you want it coloured you can always dye it. Over here dyeing is a good alternative because of the price of quilting fabric.
Might be called something different there though, I've noticed alot of things have different names. What is called muslin here, you wouldn't dream of putting in your quilts :lol: is a fine mesh type stuff used for draining jellies, wrapping old fashioned puddings to cook,baby wipes, that sort of thing