The rain & dust cover is made of high quality PU coated waterproof material. It is Sun-resistant, rainproof and dustproof. Perfect for outdoor, traveling, riding, climbing etc. With elastic design, it is able to adjust the size according to different backpacks. Can be free folded in the sachet, it is portable convenient and ultra-light weight. It is easy to maintain. It has Clip Lock mechanism that holds the bag tight .Actual product size and color may vary by /- 3 % from the size and color mentioned and seen in the photo due to screen resolution settings or due to different production batch. The backpack shown in the image is only for reference and not for sale