【COMFORTABLE PADDED BACK AND STRAPS】You shouldn't feel pain due to the thin back straps and back, yes? Don't worry, we have replaced the overall design with thick padded straps and back, which is breathable and soft just like a foam mattress, making it extremely comfortable to wear and feels lighter to hold. 【Waterproof】70D x 200D nylon fabric makes water not easily penetrate into the surface of the school bookbag so that it keeps your items dry in the rain. In addition, this type of fabric dries quickly and easily. High water resistance performance.