The back roller classic comes in a new sun yellow color. With its highly waterproof and dustproof functionality, this stylish form is a long-selling model that continues to be loved by all over the world. It can be used for a wide range of occasions from travel to daily use. It is recommended for use as a pair during travel situations, or as a single item for daily use such as commuting to work or school. Equipped with QL2.1 system.