If nothing else, a waist pack should fit you comfortably and not hinder your run in any way. It is tough enough to clock miles through a trail, on a track, or along a hilly trail, so you do not want a piece of gear to distract you. Many packs fit in roughly the same way when it comes to style, but there are packs that will work better, because of the adjustability features present. It is also important to note, that running waist packs can come in unisex, or are built specifically for men or women. Fit is very personal, so this does not mean that you need to buy a women’s pack if you are a woman (or vice versa if you are a man). Simply take your preferences, reviews, and specific body type into account and make a choice that best suits you.