I bought it at Disneyland some time ago. Can boys carry this bag?

This should be a backpack. If it is a younger boy, it is definitely possible. It's all cartoon patterns, just right. If you are a little older, such as 15 or 16, I think you can carry it on your back, preferably on one shoulder. I think this is actually a fashion, but the clothes you wear can't be too formal. You can wear something fancy or sportswear. You can't recite it when you are old. A little naive.