F Gear Repel 30 ltrs Rain and Dust Cover for Laptop Bags and Backpacks Keep your laptop backpack/backpack dry on a rainy day with F Gear rain cover. With elastic design, it is very convenient to adjust the size according to different backpacks. Buy this rain cover for carefree traveling and tourism with your laptop bags. Suitable for different styles of bag of between 20 and 40 liters.