What's the difference between a running belt and a hiking hip pack?

Running belts are slim, low-bounce, and built to hold a phone, keys, and gels close to the waist, while hiking hip packs are larger (often 2–5 liters), frequently include water-bottle holders or hydration sleeves, and may convert to a crossbody sling. If you mostly need a phone holder for cardio, a belt is lighter; if you carry layers, snacks, and water on trail, a hip pack is more versatile.