You can find all types of class 2 vests but this one has  both high visibility as well as lots of pockets. For pockets you have a backpack type pocket...

Ideal for day excursions and sample collecting trips. Dimensions are 17.5x16.5.7”, 2125 cubic inches, weighs 20 oz. Special padded back with air cooling system, foam padded shoulder straps and waist...

Makes it possible to continue working at night or in underground environments, available in various models.