It is a small bag, but I think it is enough space for children aged 1-3, to whom it is addressed. Since we don't want to burden their shoulders. It can fit a bottle inside, I have also put two small books in it, or snacks or some small favorite toys. My little one is 19 months old. It fits perfectly on her shoulders and doesn't fall off because it closes in the front. It also has a safety strap, which I was against, but it ended up being a reason why I bought it since I travel frequently by plane, I believe it will be quite useful. Because at this age, she can't sit for a long time either in my arms or in a stroller. She wants to walk and explore. But I can't have her completely free at the airport.