Okay, so imagine you are going on a really long trip, like a big adventure. You need to bring lots of things with you like clothes, toys, and snacks. But all of those things won't fit in your regular backpack. That's where the nuberu bagu comes in.
A nuberu bagu is a special type of backpack that is really big and can hold all of your things. It's like a magic backpack because no matter how much you put in it, there always seems to be room for more. And even when it's really full, you can still carry it on your back without it being too heavy or uncomfortable.
Nuberu bagu is a Japanese phrase, and in English it means "cloud bag". That's because the bag is so light and comfortable to wear that it feels like you're carrying a fluffy cloud on your back. And just like clouds can bring rain, the nuberu bagu can bring all of the things you need for your adventures.