The Navigator Lite Pack 15L is built for the minimalist that still needs a functional and feature rich bag. This bag is 20% lighter than the rugged Navigator 15L Pack. If you need more space while on the move, you can expand this bag an additional 6L, taking it from 15 liters to 21 liters. In the main compartment of the bag, we added a 3/4 zipper, giving you wide access and full visibility inside. The back of the bag has a EVA formed foam panel for comfort and breathability.