Thank you for viewing. Purchased in 2024. I bought these for climbing Mount Fuji, but I never used them, so I'm selling them. Water reservoir, 2 liters, blue, set of 2, lightweight, replacement for hydration backpacks, for running, hiking, camping, cycling, climbing, etc. I opened one of the bags, but it's unused. The opened one has some scratches on the surface, but there's no problem with putting liquids like water in it. Please refrain from purchasing if you are sensitive to items stored at home.