Recommendation: The running belt can hold up to 750ml water bottles, but we sincerely recommend that the best experience when running is that the water bottle should not exceed 500ml, and you can carry 750ml when walking. Multi-Use for All Activites:The fanny pack is not only for running, exercise, gym, high intensity workouts, fitness,walking, jogging but also great for cycling, hiking, fishing, mountaineering, camping, travelling, daily leisure, etc.It will be perfect companion for all activites. Large capacity: The fanny waist pack have 3 zip pockets which provides large and safe space for your phones as well as your house or car keys, ID/credit cards, cash, earphone, iPod and other accessories while doing exercise. It can fit up to 6.5”inch phones even with otterbox case ,and the zippers can protect your phone from falling down during even intense sports.With three independent pouches, you can put your keys and phones separately to avoid scratching your phone. Comfortable& Durable: The running belt made of high-quality breathable waterproof fabric ,which can effectively prevent sweat and rain from your phone. Reflective tab on the pocket ensures your safety in the night runs .It’s also lightweight and durable, made for heavy duty use. Premium design:The running belt bag design with 3 zip pockets,one can unfold to use as bottle holder(Bottles NOT Included)which can fits up to 750ml/25oz bottle, If you don't need to bring a running water bottle,you can pack it up to meet your requirement. No bounce adjustable belt can fits waist sizes from 23" to 49". Design With headphone outlet,make it easier for you to enjoy music while exercising.