I bought this for my son who binder is 5 years old. The trolley is light and even if "the cove" to get the briefcase seem very durable and does not easily fit into its storage, the child easily handles the object. It is not too small nor too large. A4 binder small back returns. That said, I do not think the trolley exceed the CP because the interior volume probably be enough for EC1. The image "Transformers" delighted boy. To be compared with the other products with Transformers image, I believe that the object is very good value for money. At resistance with time, I doubt he does two years (anyway, it will become too small) but for Tiny Tots Grande Section and PC, it is very well.