Best nursery lunchbox design

[AlltheFs]

DD (will be 4, she is September born so an older nursery child) is moving nursery settings in September and will need to take a packed lunch for the first time. Which lunchbox designs or features do you recommend?
She’s a big eater so it will need a decent capacity. Do I want something like the bento boxes with little sections or not?

There’s so many online I got stuck down the rabbit hole.

I love the bento boxes. Sistema do a nice big one.

My dc have had the bento box style since reception, it's so easy to send in a balanced selection of food they enjoy, they love it.

My top tip is to look for one that is dishwasher proof if you have one! Much better than washing up with sticky left over sandwich particles smeared everywhere 😆