We bought these after our kids asked for suitcase chairs that fit their size. The locking feature is helpful to prevent accidentally folding them and it has a cup holder, just like an adult chair. They're a bit tricky to pack into tote bags, but if you're like us, you'll still lose the bag soon after you get the chair π. For reference, this is a great size for kids aged 1-7 (in my experience), but they might fit older kids too.