1.Select the size according to the number of stay daysThe capacity of the suitcase is as small as 16 inches to 32 inches. It is recommended to choose according to the number of days to stay. 2.Choose materials and functions according to your destinationA.Lightweight soft case luggage: domestic travelB.Durable hard-shell suitcase: travel abroadC."TSA lock" that is also safe to travel to the United States3.Zipper lock and aluminum frame lockThere are two options for closing the trunk: zipper lock and aluminum frame lock. The advantage of the zipper lock is that it is light in weight, and it can be pulled apart only to take out the inside, and it will not burst out due to impact during transportation. hashtag4.Confirm the number and stability of the wheelsThe wheels of the suitcase are available from two to eight rounds. Wheels with less wheels, the wheels themselves are more mobile, but if the baggage is too heavy, it will be more difficult to drag. On the contrary, the wheels are more mobile, but the luggage is more convenient to move.