The b.box double-walled stainless steel thermos seems to be a very practical and well thought-out product for children. Here is a summary of its features and advantages:

1. 335ml (11oz) Capacity : Ideal size for kid-friendly portions, whether for kindergarten or school.

2. Keeps Food at the Right Temperature : Capable of keeping food hot for up to 5 hours and cold for up to 7 hours, which is perfect for a wide range of foods from hot meals to fruits and yogurts.

3. Quality Material : Made with double wall stainless steel, which guarantees durability and efficiency in temperature preservation.

4. Child-Friendly Design : Features easy-grip handles and a removable base. These features are ideal for encouraging children's independence by allowing them to open the thermos easily.

5. Adaptable for Children of All Ages : The handles and base are removable, allowing the thermos to adapt as children grow.

6. Safety in Use : It has a unique safety feature that prevents parents from tightening the lid too much, making it easier for children to open.

7. Includes Spork Cutlery : Comes with a combo cutlery (fork/spoon) that stores in the silicone base, which is convenient and space-saving.

8. Easy to Clean : It is dishwasher and sterilizer safe, making cleaning and maintenance easy.

9. Free of Harmful Substances : The thermos is free of BPA, phthalates and PVC, ensuring that it is safe for food and children's health.

10. Compact Dimensions : Its dimensions of 10.7 cm long, 14.3 cm wide and 15.5 cm high make it compact and easy to carry.

This thermos seems to be an excellent option for parents looking for a practical and safe solution to keep their children's food at the right temperature during school hours or excursions.