When the vacuum bag is not in use, it is designed as a grooved structure, consistent with the backpack cavity, and would not occupy the space in the original backpack; When using the vacuum bag, the bag body can be stretched to a dimensional shape where twice the capacity of clothing can be packed inside; After compressed exhausted, the bag will restore into a vacuum status, the original three-dimensional bag space can be reduced from the original 0.04 cubic to 0.02 cubic;

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