Not a durability issue, but I just got a JRB Old Rag Mountain in the mail today (thanks, Pan!). He sent the standard compression sack with it - which was cool - but it's not big enough. The quilt barely fits in the sack with no room for the rolled closure to work. It'd be big enough with a drawstring, but not the compression top.
"Physics is the only true science. All else is stamp collecting." - J. J. Thompson