This is a backpack cover made with Tyvek Silver. It covers your backpack by cinching it with a cord passed through loops, measuring 80cm wide and 110cm tall. The cord is designed to cinch and wrap around the backpack. The parts where the loops for the cord are created are machine-sewn. Loops made of Tyvek are attached to both sides, allowing you to tie the cover to your backpack with carabiners or thin cords to prevent it from blowing away in strong winds. The color and shape of the cord and cord stopper may change. A storage bag (14cm x 15cm) is attached to the main body, so you won't lose the bag. The backpack in the reference photo is filled and measures 36cm wide and 77cm tall. Weight: 79g The red backpack cover in the reference photo is a commercially available one for 30-45L capacity. The last reference photo shows water beading off. Tyvek lettering or similar will be printed on one side. The design and color may change. Although unused, due to the nature of Tyvek, there are wrinkles and creases. The material is excellent in water repellency, but please note that it is not completely waterproof. Carabiners, backpacks, and other photographic props are not included. Only the backpack cover is for sale. This is a handmade item by an amateur, not a manufactured product, so please refrain from purchasing if you are looking for perfection. ★Tyvek® Silver is a sheet made by vapor-depositing aluminum onto the high-density polyethylene non-woven fabric Tyvek®, and then applying an antioxidant resin coating to each fiber to prevent aluminum degradation. Unlike other companies' products that simply sandwich a breathable aluminum layer between a thin waterproof film, this is a robust building material with little degradation of waterproofness even after long-term use. From the website of Asahi Kasei DuPont Flash Spun Products Co., Ltd. Thank you for your consideration. Function: Lightweight Material: Tyvek Size: 30-45L