I was looking to replace my old running belt and I am glad that I took a chance with this one. My phone (Galaxy S9) fits well as do cards, chapstick, keys, and other small items. My biggest fear was that this belt would slide or bounce too much as other running belts that I have used in the past have and it drove me crazy, especially when racing. This belt stays put and is really super comfortable even for longer runs. I have worn it over running pants and shorts and it doesn't shift or slide over either materials.