Purchasing a hydration belt or vest can have many benefits for a runner, during any time of the year. A hydration belt will usually be strapped to the waist and contain either just a pouch, where you can put money, keys, or phone etc. Or also have a compartment for a water bottle too.
Hydration vests are lightweight and go over your top with chest and waist straps. They will have compartments for keys, money for example and will also have side pouches, where you can have water bottles. They also have a compartment in the back, and some will have space for a bladder, but also can be used to store light clothing.
These can be used any time of year, especially if you do not like carrying things when running, or if you want to lose that extra layer during your run.