This is a Boston bag (duffel bag/carry-on bag). It's a 3-way bag, allowing for hand-carrying, shoulder carrying, and cross-body carrying. The base capacity is 25L, and when the expansion zipper is opened, the internal space expands by approximately 40%, allowing for a maximum storage capacity of 37L. It's suitable for a wide range of situations, including commuting, short business trips, school trips, fitness, and outdoor activities. Weighing approximately 640g, it's very lightweight and uses high-strength fabric, making it resistant to abrasion and tearing. It features a multi-compartment structure with a wet/dry separation bag, front pocket, side pockets, back pocket, and shoe compartment. You can organize and store changes of clothes, shoes, documents, digital devices, and toiletries. The size is 48 x 20 x 48cm, making it suitable for carry-on luggage. Its shape also makes it easy to fit in a car trunk or under a desk. The adjustable shoulder strap allows for comfortable carrying to suit your body type. It can be used as a travel bag, sports bag, gym bag, or commuter bag, and its simple and stylish design makes it an item that easily fits various lifestyles. #BostonBag #TravelBag #DuffelBag #3way #LargeCapacity #37L #ExpansionBag #LightweightBag #CarryOn #SportsBag