Based on the instructions at the McHale site, my spine is 20" (from the 7th cervical vertabra to the medial area of the illiac crest). I would recommend the site to anyone seriously thinking about buying a McHale pack.
Thank you, Vickers, for the link. Unfortunately, it was the only part of your rant that was useful, informative, and accurate.
Originally, I had wanted to sell this pack on consignment at the American Alpine Institute here in Bellingham. They recommended this site, telling me that I would have better luck. So far, it has been "interesting".
Now.. I think I will pour myself a fine Cabernet, retire to my dacha in Nigeria, and count my bogus money orders... ;-))