Shoulder girth is far too tight for most normal males. 30+ years ago I had a Marmot bag with a 58" shoulder girth... I tolerated it, but it's just too tight. The REI Kilo is 57" for size regular.
Anymore I prefer 62" shoulder girth in a bag, though I could tolerate as low as 59".
BTW, I'm 5'-10" / 160 lbs.