Whether a vest pack or belt would be a better option for you is entirely dependent on your level of activity and what you hope to gain from these products. Longer runs and longer trail races would warrant a running vest pack, as your water refill stations may be far apart or non-existent. Your trail run or race may also require you to take along extra gear such as a waterproof jacket, extra nutrition, gloves, and first aid kit all of which can easily be carried in a running vest pack but possibly not fit into a minimalist running belt.
Alternatively, wearing a hydration belt would be more practical for shorter runs and races. If you’re still unsure of which option would work best for you, take a look at this quick summary of advantages offered by vest pack and belt respectively. 

Advantages Of Choosing A Running Vest Pack:
A running vest pack is vastly beneficial to anyone spending long hours out on the trails. A vest pack can simply hold more water and gear, which is essential when you’re covering long distances and need to keep up with your body’s demand for hydration and nutrition.
A vest pack is also the better option for those who need to carry around a lot of gear during their runs. If you have a phone, jacket, extra nutrition, chargers, and more that you need to take with you on your runs and races, then a vest is the right choice for you. Vests are can carry plenty gear without being too bulky on your back.

Advantages Of Choosing A Running Belt:
If a vest pack doesn't sound like the right option for you, you could consider getting a running belt instead. Running belts are favoured by short-distance runners, as they are built to fit snugly around your waist and carry only the absolute essentials.
Running belts are a great option for anyone who simply wants to keep a water bottle at their hip during short distances and carry other essentials such as a phone, keys and gels. Alternatively, a running belt is a great add-on for the very long ultra-distance trail races where they can supplement your running vest pack to carry additional nutrition, a phone and trekking poles.

Running less than 1 hour
On short runs for less than an hour, most people can get by without carrying any fluids. A fluid belt with a single bottle of 250-500 ml, or a smaller running vest/running backpack might also be a very good idea to bring, especially if its hot.

Running between 1-2 hours
If you are going out for somewhat longer runs, it might be a good idea to bring fluids and possibly energy-products or something else to eat. For this purpose one of the smaller running vests with a capacity of 2-6 ltr would be the perfect choice. Here you will find room for fluids, energy products and possibly an extra jacket or other clothing.

Running more than 3 hours
When you are active for more than 3 hours, you simply MUST bring fluids and energy products. lts also a good idea to bring extra clothes like a jacket, a hat and a neck brace, so you can change your clothes if the weather should change along the way.
Haimont Running backpack 5L or 8L with room for 2pcs 500ml soft bottles. Room for energy products, mobile, keys, fluid bladders and extra clothes.

Ultra running
For ultra running there is usually a number of things that you need to carry Therefore you need storage room so, in addition to fluids and energy products you can bring your mobile, clothes, a survival blanket, first-aid kit, hiking poles etc. Haimont Running backpack 10L series can meet this requirement.