Redline D1Bag Gym bag or backpack? Redline D1, designed for sports lovers, can be used as both: the handles of the bag become the shoulder straps of the backpack and allow for a dual use. Redline D1 is equipped with a large central compartment with inside pocket, two ventilated side areas for wet clothes and shoes, a water resistant compartment for storing wet dry clothes, a space for food, a rigid case for glasses and an insulated pocket for water bottles.