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Everyone plays a variety of roles in daily life, which require you to change your bags from time to time. After having gone hiking last Sunday, you need go to work in such a hurry with your briefcase in Monday morning that its probably to forget something in your backpack being used yesterday. Here is a new way. Additionally, what if your friends date you after work? Go to a party without a casual bag? To save time and trouble, you just need bring the inner bag into other bags rather than move things one by one.