If your suitcase is plastic, most of the suitcases are waterproof now, so you don't need to buy extra protective covers. But if your suitcase is canvas, the need for waterproof and protection is even more important. At this time, you can choose to buy a protective cover.
The main purpose of purchasing protective covers is to protect suitcases from wear and pollution. Especially when your suitcase is subjected to violence during transportation, the protective sleeve can play a very good protective role. In addition, the protective sleeve can also increase the personalized features of the suitcase, improve the recognition and reduce the chance of being taken by mistake.
Generally speaking, for plastic luggage, there is generally no need to buy protective covers, while canvas luggage is recommended to buy protective covers to increase its waterproof and protective performance.