Durable and kid tested and approved glass containers anyone? I’ve had two of those Lunch Cubes of years and they never failed me! Those containers are 4 to 5 times stronger than a drinking glass. They can hold up to 28 oz/850 ml, which I found was the perfect quantity for a filling but reasonable lunch. Its silicone-sealed, leak-proof lid is entirely watertight, I trust it even full of soup in my favourite bag!
They can be used as takeaway containers, as well as simple containers to store food in the fridge or in the freezer.
They are also BPA, PVC and phthalate-free (and available in funky colours that will not fail to brighten up your day! ☀️).