This is a portable stuff sack from "3F UL GEAR (Sanfeng Chu)", a popular brand among ultralight (UL) hikers. Material: Made of **Tyvek (DuPont Tyvek)** from DuPont. It is very lightweight, yet has excellent durability and breathability/water resistance. Specifications: Model: B (White) Weight: Approximately 200g Size: Approximately 230 x 90cm (Type B) with head cover Storage Size: Approximately 16 x 8.5cm Condition: New, unused. Use: Sleeping bag cover Based on experience from yamanobori.site, I have selected lightweight and reliable gear. Recommended for those aiming for the UL style. Anonymous shipping. It will be shipped by mail service, taken out of the bag and folded. Please be aware of this.