I found a kitchen miscellaneous goods "serial container" at "Flying Tiger Copenhagen", a store from Denmark that sells Scandinavian miscellaneous goods. I actually bought it and tried it out. The price is 250 yen per piece (excluding tax).
This is a container where you can carry cereal and milk together. If you put the cereal in the dome-shaped upper container and the milk in the cup, you can drop the cereal into the milk just before eating and enjoy it with a "crispy" texture.
A set of spoon, lid, cup and dome
The amount of cereal that goes into the dome is slightly less than the usual serving. When eating, open the lid part up and drop the cereal in a cup of milk.
The spoon of the set is matched to the size of the cup, so it is ◎ to scoop up to the bottom properly. The tip has a deep dent, making it possible to enjoy milk and cereal at the same time.
However, what is worrisome is the gap between the cup and the lid. Even if I closed it quite tightly, when I laid it down, milk leaked out. It seems that there is no problem in carrying it straight, but it seems difficult to use it with the same feeling as a normal water bottle. Be careful not to tilt it.
However, the "cereal container" looks cute and can be used when you want to change your mood and enjoy lunch outside. You can buy it for less than one coin, so you can leave one at home. Why don't you pick it up when you see it?