Trunk:

Also known as suitcase and luggage case, it is a box to put things when you go out, and it is one of the types of luggage. Usually, luggage is used to store clothes, personal care products and souvenirs needed during the journey.

Content introduction:

Early suitcases were made of wood or other heavy materials. With the popularity of air travel, the materials of suitcases tend to be lighter hard plastic or cloth. Most models are also equipped with a built-in small wheel, which can be easily pulled by a pull rod. In recent years, there have also been suitcases with four wheels, which can not only rotate 360 degrees, but also be easily pushed on the flat ground. 　

In addition, luggage can also be divided into hard-shell luggage and soft-shell luggage according to the shell. Hard-shell luggage is more resistant to falling and suitable for luggage that needs more protection. Soft-shell luggage is usually lighter in weight and more flexible in capacity than hard-shell luggage. However, the zipper position of soft-shell suitcase is more likely to burst because of too many objects inside.

Canonical size:

The size of suitcases in the market is generally based on the size of the carry-on boarding box (hand luggage) and consignment box (checked luggage) of airlines (International Air Transport Association). For example, Cathay Pacific stipulates that the maximum size of each piece of checked baggage must be less than 158 cm, while the maximum size of each piece of hand luggage must be less than 56x36x23 cm.

Smart suitcase can move with the owner:

People walking dogs, pigs and cabbages on the street are not unusual now, but have you ever seen anyone walking suitcases? With the progress of science and technology, it has become possible to walk the suitcase. Recently, an Israeli company launched a smart suitcase, which can see the owner's position through the built-in camera and connect with the owner's mobile phone via Bluetooth, so that it can "walk" around the owner by itself [4]. With such a suitcase, you no longer have to worry about dragging stupid and heavy luggage.