& Bottom Extension Design: Greatly save space after folding, easily carry on your flight and travel after expansion. Great idea as an extra bag into your luggage bag. Folding Dimension: 11.81in x 1.97in x 7.08in. Unfolding Dimension:16.53in x 9.05in x 11.02in. Expansion Dimension: 16.53in x 9.05in x 15.74in. & Wet Separation Design: This sports gym bag have the high density water resistant material can help you to separate dry items and wet items,If you encounter wet clothes or towels while running,playing ball,fitness,swimming and other activities,you can put it in this crossbody bag. make you more comfortable in your daily fitness and journey. & Convenient: Handbag storage you can carry it by hand or carry it on your shoulder,or you can easily place it on your luggage through the fixed belt design on the back,which is convenient for storage and transportation,and makes travel more convenient.