I did the measurements how they suggested, and came out to a 34. A small tritop is 31-33, and a medium is 34-36. So I'm right at the bottom of the medium. I'm afraid of getting it and it not binding well though. But I'm also worried that I'll get stuck in the small or something lol. I've never had a binder before. I have a C-cup chest, and I'm 5'7 about 150lbs. What would you guys do if you were me?

Personally I was in the low large range but I went for a medium and am glad I did. It was snug in the armpit area for the first couple of weeks but when it loosened up it was perfect, the large probably would've not bound well.

thanks for your input, if that's the case i think i'll just go with a small then 

edit: i ordered it. now to hope i get no questions from my parents when a package shows up for me lol. i'll post an update in the binder comparison thread when i get it.

I'm 5'5'' 135, B cup and medium is too small and tight to breathe in, and I got 35 as the measurement average. Get a large. They run really small, and stiff.

hmm, well the small works fine for me, and it's not difficult to breathe in. to each their own, i suppose.