Got the smallest size in this vest and it was terrible. After drinking out of a vest during a practice run, he jumped EVERYTHING and had nowhere to pull it up to shrink after drinking out of it. Also, it was personally too heavy for me when I was half full (although that's to be expected!). I ended up walking about 7 miles home just because I couldn't handle this vest. I ended up buying a Salomon vest in size XXS and I'm in love! (For reference, I'm 5ft 5in, 100lbs and 31 bust sizes.