Thank you for viewing. I am selling a B-FORM Bi-Form ACE backpack in black. It is a nearly new, excellent condition item. I hope to pass it on to someone who is looking for it. Thank you for your consideration. From the following website: The weight of the luggage in the backpack works on the back through an S-curve, supporting the creation of an ideal posture. Compared to regular backpacks, which tend to make the head lean forward, this backpack is designed to stabilize posture, making your standing posture look beautiful. Newly developed shoulder pads with special cutting are used! It is designed so that the shoulders naturally open outward without compressing the chest. When the chest expands, both elbows also move back, and the walking posture becomes beautiful. A4 size storage is possible. Chest belt is also included. ■Size [approx. W30 x H38 x D15 (cm)]