I use my SPIbelt on every run! The material is so stretchy and the pocket expands to fit my keys, phone, ID, and money. No matter what I put in it, my SPIbelt does not bounce around. In fact, it is so comfortable, sometimes I forget I am even wearing it! My SPIbelt gives me peace of mind because I don't have worry about losing my keys or getting in touch with someone in case of emergency mid-run. I don't have to stash my belongings anywhere and it keeps me hands-free. I recommend a SPIbelt to all runners, whether you are heading out for 3 miles or 26.2 miles!