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People find it hard to pull and change the direction of a heavy suitcase when the weight is shifted to the bottom. A wheel sticks out and provides a support when the lower part of the back side of the suitcase is pressed. The support disperses weight preventing it from shifting to one side, so anyone can easily and stably pull the heavy suitcase.
daegu, South Korea
sang eun park,
na young kim,
changwon national university
ji young son,