A traveler zips her Multifunctional Cosmetic Bag shut and drops it into a carry-on beside a leaky shampoo bottle. She wonders whether the fabric will hold up if that bottle tips over during the flight. The question of whether a Multifunctional Cosmetic Bag is waterproof comes up often among people who pack skincare, makeup, and toiletries in the same pouch. yisenbag manufactures bags with...