Waterproof bags are important as they provide a barrier against water or moisture, protecting the contents inside from getting wet.
Waterproof bags are important as they prevent water from staining the ground, office desks, and other places when using an umbrella.
Waterproof bags are important in the invention of an umbrella as they can be used to store a dripping umbrella body in rainy days.
Waterproof bags are important for protecting products from water damage.
Waterproof bags are important as they can be used to block overflow water without the need for soil, reducing labor intensity.