The size is average. I bought the black one, which is not opaque. The seams and zippers are all size 100. I have bought it for more than a month. I will definitely come back to buy it. This is a perfect bag. The correct size is suitable for many things. I put it in my work and school for professional notebooks. The belt is super thick. I strongly recommend it. I really like it. I really don't know how to get the things in the bag wet, and its size is very comfortable, because it is larger than you think. I love her because I see her. She is very gentle and practical. I was canceled. But I asked again. Believe me, this is the best I can do.