
I bought this vest (coral 4L) medium size. I couldn't measure myself to be sure but it fits me perfectly! I still buy everything medium sized so it's turned out well. I'm 5'9" tall, 135 pounds and wear a 32" or 34" bra. It fits me in both a thin shirt and a thick hoodie as shown in the picture above :) Of course there is Straps to adjust this so the bottles that came with mine are great (I was afraid I would get old broken but I didn't) I've read that if you get leaks just contact Nathan and they will ALSO help you, I ordered Nathan's 1.8 liter tank for this vest and it fits great! I know it says it can only take 1.5 liter bladders or less but their 1 .8 liter bags fit well :) I've also written a review on Amazon for the bubble if you're planning the same top or something like that. So if you're in doubt about getting it, go for it!

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