Imagine you have a big plastic bottle. Now, think about putting something inside it like a toy car or a small ball. You can easily take it out. But what if you wanted to put something so big in it that you wouldn't be able to take it out? That's where an impossible bottle comes in.
An impossible bottle is a bottle that has something inside it that seems like it shouldn't fit through the opening. People often make them as a kind of puzzle or a trick. They might put a whole deck of cards inside or even a ship in a bottle. It's called impossible because it seems like it's impossible to get the thing inside.
To make an impossible bottle, you have to be really careful and patient. You have to use tools that can bend the thing you're putting inside so it can fit through the opening. Once you have the thing inside, you can't take it out, so you have to plan carefully before you start.
In short, an impossible bottle is a bottle that seems like it shouldn't have something inside, but it does. It's a fun puzzle that takes a lot of time and patience to create.