It is vital you get the best running belt that won’t lose your precious cargo. You’ll likely have several small items that require storage while running. As with fluid, each running waist pack has a different holding capacity for cargo; some have enough space to store big items such as clothing (e.g., jackets) while others can only hold small items such as car keys, food, and cell phones. If you plan on being out all day, it is better to get a pack with enough cargo capacity to store clothing.