Resistance to permeability: Nylon fabric; double layer PU coating; good rain resistance, protect the backpack from moistureApplicable to children's bags, fluorescent bars will have a reminder to go to school. Don't worry about going home. High quality: sewing thread caulking. Threadless sewing to prevent wear, lightweight and compact products; foldable, easy to carry Suitable for different types of backpacks: 30L-35L, suitable for most types of bags or backpacks. Fluorescent reflective tape: waterproof and rainproof to provide reflective tape, it is a warning color. When light hits the beam, the color reflections increase visibility of darkness or flow and road safety. Outdoor Sports: Just put it on your bag to keep it dry and help you through rainy weather during outdoor activities such as camping, hiking, biking and more. Protect your heavy luggage from wet contents in the rain.