Just cause I'm a fan of these, I'll ruin things for everybody again with a deeper dive that nobody asked for. I've bought/had/sold a bunch of these beauties, am down to just two now, neither currently in use, and definitely neither of them for sale.
The bags in question are the Berthoud GB604/9.6L and GB704/7L. If the model numbers confuzzle your logic (Lower number is bigger? 7L has "7" in the number, but why is the 9L bag "6"?), IIRC Mr. Berthoud numbers his creations by the date he dreamed them up, so the 9.6L bag was birthed in June '04, then the smaller 7L bag came along a month later in July. His model numbers are a combo road map and calendar.
These two particular bags IMHO have the look and elegance of those early automobile trunks, which were actual trunks(bags) sitting atop a rack. Which these could be, for a bicycle. Visually there's both a strong retro and definite carriage-trade appeal, and people seem to viscerally respond to them in a way they usually don't for other similarly constructed canvas/leather bags. A photo of my Waterford ST-22 with a gray B604 attached is my most-liked photo on my flickr account, and though the bike itself is very nice, I don't think it would get anywhere near as many clicks if it had a different bag. It's the rug that ties the room together.
The mounting/rack system is unique, afaik, in the true sense of the word. I don't know of any other bicycle bag that requires support from both the bottom and top of the bag. That additional complexity, and all that rack, somehow doesn't detract from the overall loveliness. How can something so visually clunky still look so pretty?
But the rack is indeed very heavy, and I've long wondered how much of that metal is really necessary, and how much nicer it could be without it. And as somebody who always wants rear rack bags sitting as low as possible, I usually mount mine with the seatpost stem upside down, which puts the elegant Berthoud logo upside-down as well. Tres gauche.
But the rack also provides great support, and somehow still allows near-full access to the bag top.
My not-ready-for-primetime solution was to chop up one of the racks and zip-tie it to a VO Constructeur rear rack, which is about the most minimalist production rear rack around. It still looked a little clunky, but it changed the bag from a seatpost bag to a rack bag, and I like it better that way. Puts it in a better position, cuts a lot of weight, and looks like a proper trunk atop a Duesenberg or Bugatti. Note that I'm not a vintage car guy, so apologies if either/both of those marques never had old-timey trunks. Cord? I'm not a fan of zip-tied racks though, so I've discussed having a rack gugified by Dr. Gugie into a solid one-piece solution.
In terms of pricing, you could say the Berthouds have carriage-trade pricing to match their looks. But you'd also be overlooking other expensive small-production boutique bicycle bags, which can be just as pricey. Many of those using mere nylon, zippers, elastic drawcords and plastic hooks. Ewww. But, yeah, 225 Euro for the 604, 196 Euro for the 704 and 108 Euro for the rack---cheap they ain't. They are built to last, so there's that.
And final thoughts (yay!) on pricing/resale, first stating that I hate to admit the truth that when selling used items, things are worth what people will pay, not what I want them to be worth. $100 shipped for Joe's 604/rack was an incredible bargain. Crikeys, it's $400 new! That said, I've never been able to get much more than $150 for these used, plus maybe $25 for shipping. Like so many things I'm inordinately fond of, that seem to somehow always have limited appeal, I always get less than half of new cost for these, even when they look essentially new. I don't think it's a Berthoud thing, I often see used Berthoud front bags sell for much closer to their new price. Rear bags are not the hot ticket these days, not many folks know about these Berthouds, they're definitely an acquired taste, and most of the used ones you see for sale are from folks saying "I tried it a couple times, but..."
Pix: 604 mated with a I fergit front Berthoud on a Gunnar Street Dog canti fixed gear frame, note stem upside-down-ness. And the 604 zip-tie rear rack on the W'ford ST-22. Can't find any pix handy of the 704 on anything.
Paul Brodek
Hillsdale, NJ USA