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In a considerable part of the world's poor areas, local women can't afford to replace frequent sanitary napkins so that they can only pass their period through something that not clean and hygienic, which makes them vulnerable to disease. The sanitary napkins I designed for them are recyclable and hygienic. They only need to put absorbent materials into the sealed waterproof bag of the napkin. The absorbent in the water-proof bag can guide blood absorption through the one-way absorbent quick-drying materials which on the surface is nano-bacteriostasis , and only need to replace the absorbent materials in the water-proof bag in the next use.