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Store face masks lying flat!
It is better to store face masks lying flat rather than standing upright. This is especially true since people often purchase masks in bulk rather than buying them one by one. In such cases, it is best to store them lying flat with the flat side touching the surface. If you store the pack upright, the essence may pool at the bottom, reducing the effectiveness of the mask on the opposite side. For those who desire a cooling effect, putting it in the refrigerator for a short time before use is also a good option.
Source https://post.naver.com/viewer/postView.naver?volumeNo=32419465&memberNo=54067778