I'd love to see all of your replacement outer bags on Eurekas (and other upright vacuums). Also, does anyone have any info on the Eureka "UPRIGHT" replacement bags?
I have a (presumably generic) replacement bag on my red Sanitaire SC686 that looks identical to the original red dump bag except it's got a zipper up the back for an F&G bag conversion. It's made of the same heavy canvas fabric as the original and has the same "Heavy Duty Commercial" markings. It even has the same metal clip at the top like the original dump bag it replaced. Generic replacement parts for the commercial Sanitaire machines are plentiful and cheap and many will also fit their Eureka counterparts.
I'm sorry I can't provide a photo at this time. The machine is packed away in storage right now.
I had one just like this on a Eureka a lot like that, but with a different shaped hood. Bag said Eureka but it was in brown lettering so I'm guessing early replacement. It was too damaged to keep, otherwise I'd send a pic.