Dana Design pack owners!

I have an opportunity to get a Dana Designs pack. The pack has a tag saying "M" which I assume is medium.

Tegarding size, the seller says

I just measured the pack from the top seam on the perforated back panel down to bottom seam of the tailbone pad. it is 21 1/2".


The belt has an adjustment of 3" top to bottom. If you set the belt at the lowest point it measures 18 1/4" from the centerline of the belt to the top of the perforated back pad.
Measuring my back from C7 to the iliac crest gives me 23.5" and in my previous pack, I had a "tall" (Arcteryx Bora 95).

Would this pack fit?