The Nike Kiger 4.0 Vest can hold up to 3 liters of water to help keep you hydrated on the trail or on your run. Form-fitting, lightweight fabric is ultra- breathable and won't slow you down. Designed with an eye for all the essentials, this vest features trekking pole holders and a whistle. 5 secure front pockets hold both 750 ml flasks and personal items, while the rear compartment is able to hold a 1.5L hydration bladder.