This is a stuff sack made using Tyvek Silver. By using it as an inner bag for your backpack, you can take advantage of Tyvek Silver's waterproof properties to keep your belongings from getting wet. Size: Width 49cm, Height 64cm, Depth 10cm Please note that there may be slight individual differences due to amateur measurements. Approximately 35 liters It's slightly larger than ISUKA's 30-liter bag. Please refer to the 7th photo. The cord and cord stopper may vary in color and shape. The inside will have the Tyvek logo, etc. Although unused, there are wrinkles and creases due to the nature of Tyvek. The book (Yama to Keikoku) and the ISUKA stuff sack are photo props and are not included. The material is excellent in waterproofness, but please note that it is not completely waterproof due to the sewing. This is handmade, not by a manufacturer, so please refrain from purchasing if you are looking for perfection. Please understand that it will be shipped folded. ★ Tyvek® Silver is a sheet made by vapor-depositing aluminum on high-density polyethylene non-woven fabric Tyvek®, and further coating each fiber with an anti-oxidation resin to prevent aluminum degradation. Unlike other companies' products that simply sandwich a breathable aluminum layer between thin waterproof films, it is a strong building material with little deterioration in waterproofness even after long-term use. ★ From the HP of Asahi-DuPont Flashspun Products Co., Ltd. Thank you for your consideration. Function: Lightweight