Tyler and Brendan, weird how these things work out....I'm alongside both of you guys, at 5'9" , 140lbs...I have a 38" chest, and 15" neck and fairly broad shoulders in relation to my size--but it just didn't work out for me. Good call on pulling the collar up...if I were to wear the pack with a collared shirt, it would mitigate the discomfort, but I didn't like the idea of being limited in what tops I could wear with it. For me, (and Javan Dempsey for that matter) I found the straps to be sewn too close together at the top. They are sewn at an angle so that they resemble an inverted "V." Couple that with the fact that they are 4 inches wide and straight, I found that they pinched/rubbed my neck up top, while hanging off to the side of my ribcage down below, thus hitting my inner arm when I walked. But I'm glad to hear that it works out for a good amount of smaller people too. Like everyone else mentioned, they def build the thinner shoulder straps for the size small torso packs (with the caveat that the foam is no longer removable). Also rumor has it that they were supposed to implement a curved anatomically correct harness as well. Again, maybe shoot them an email.
About the Y strap on their packs...by itself it's not very good at holding a bear can stable...the grosgrain ribbon is just too slippery. People have modded it by attaching sticky velcro to their bear can, and corresponding velcro onto the Y-strap. But you also have to have a full pack for this to work well. G'luck!