This is a storage bag for Tsuchiya Kaban school backpacks. This is not a cover for daily use, but a storage bag. Tsuchiya Kaban school backpacks are so durable that they don't really need a storage bag, but this is useful for those who want to protect their precious backpack from dust, etc. It has been stored in a cool, dark place for about 10 years. It has never been used.