This is a traditional Thai stainless steel lunchbox. It's a two-tiered, circular type. Generally, rice goes in the bottom tier, and dishes like green curry or gapao rice are placed in the top tier. In terms of size, it's 10cm in diameter and 5cm deep for each tier, so it might be suitable for those who eat smaller portions. Also, it could be useful as a container for accessories or other small items, rather than just a lunchbox. I bought this as a souvenir for a friend but never gave it to them. I've opened it to take pictures for listing on Mercari, but it's unused.