For those of you who have either a Saleya PM or Speedy 30, may I ask the measurements of the dustbag it came with? I know the speedy 30 usually comes in a fold over envelope style dustbag but occassionally comes in the drawstring dustbag... what is the size of those? The Saleya PM comes in a foldover dustbag, is that the same size as the one that comes with the 30? Will the drawstring one that comes witht he 30 fit the saleya well? Thanks much!