Took this on a weekend trip and it swallowed the Toniebox plus a handful of Tonies with room to spare. The padded straps kept my daughter comfortable carrying it herself through the airport, which I didn't expect from a kids' bag.
Emma★★★★★
Bought this for our first flight with a toddler and it fit the Toniebox, six Tonies, and her headphones without feeling stuffed. The straps are padded enough that she actually carries it herself through the airport instead of handing it to me.
Edward★★★★☆
The side pockets actually fit a couple of Tonies each, which keeps my daughter from digging around mid-car ride. Only gripe is the main compartment is a bit snug once the Toniebox and headphones are both in there. Still, it's held up fine on three weekend trips so far.