ok so i was also really confused on how to order the size i want. Scroll the article down until you get to the comparison info and there should be some, but there is a mention of size. I went to the table and ordered a small one. I'm sending it back for Wednesday. I wear small leggings and usually 6 pairs of pants maybe 8. Jeans I'm 29 if that helps. I could wear a small one, but felt like once I put my phone and maybe my passport in it (I liked the idea of using it for travel) I just didn't want it to be too tight for a long flight, so i hope wednesday will be better. I need to see if it's too big to walk. Overall the quality looks really good and so if I have to go to a UPS store to return this now I'm willing to deal with a terrible return option. I don't understand why I can't repackage the product, print the label and ship it for free like before. That's Amazon's problem, not this seller. I really like the zipper option so I went with this option.