Backpack Cover Waterproof Rain Cover - Mt. Fuji Climbing

I bought this a few days ago on Mercari for a Mt. Fuji climb, but the backpack I ended up buying came with a rain cover, so this one is unused. (I took it out of the plastic bag for the photo.)

Here is the product description from when I purchased it:

[SZSL] Backpack Cover, Waterproof Rain Cover, Pack Cover, Durable, High-Visibility Reflective Mark, Ultra-Lightweight, Waterproof Cover for Commuting, School, Rainy Season (Gray S (30-40L))
[Product Specifications] Size: 35L
[Excellent Waterproofing] Made with high-quality waterproof fabric, it can withstand water pressure of up to 1500mm, offering more than double the waterproofing of ordinary backpack covers. It prevents heavy rain and strong winds from entering, with a waterproofing effect more than ten times that of an umbrella.
[Superior Durability] The rain cover uses a 190T nylon waterproof surface and PU coating. The surface has a waterproof coating and the back is made of waterproof fabric, providing excellent waterproofing. It is particularly resistant to water and abrasion, preventing damage from friction and ensuring high durability.
[High-Visibility Reflective Mark Included] With reflective tape, it reflects light in the dark, during rain, or at night, making you more visible to others even in dark or rainy conditions. This provides peace of mind when cycling, motorcycling, or hiking, greatly ensuring safety.
[Usable in Various Scenes] Ideal for outdoor activities such as hiking, mountain climbing, motorcycling, cycling, fishing, commuting to school or work, beach trips, travel, and skiing.