Cách sử dụng
A rucksack is a type of backpack that you wear on your back. It is often used for carrying things when you go on a trip or a hike. You can also use it to carry things to school or work. In some countries, like the United Kingdom, people use the word rucksack more often than backpack. So if you visit places like the UK, it's a good word to know so you can understand what people are talking about.