This is a Boston bag (3-way type). It has a base capacity of 25L, and expands to a maximum of 37L when the expansion zipper is opened, making it suitable for a wide range of uses such as 1-2 night trips, business trips, the gym, and school trips. It weighs approximately 640g, making it very lightweight, and supports 3-way carrying: hand-held, shoulder-carried, and crossbody. The shoulder strap is adjustable in length. It features multiple pockets for easy organization of your belongings, including a wet/dry separation pocket, front, side, and back pockets, and a shoe compartment. The size is 48 x 20 x 48cm, and it is also suitable for carry-on luggage. Made of lightweight and durable material, it is perfect for travel, sports, commuting, and various other situations. #BostonBag #TravelBag #DuffelBag #LargeCapacity #ExpandableBag #SportsBag #GymBag #3WAYBag #CarryOn #LightweightBag