This is a special appendix from the "HYSTERIC MINI OFFICIAL GUIDE BOOK 2018 SPRING & SUMMER COLLECTION." Material: Made of lightweight and durable nylon, it can be washed if it gets dirty. Functionality: It's a large-capacity, big size bag (approx. H39 x W48 x D12cm), which can be used as a travel bag or a mother's bag. There's a loop on the back that can be attached to a carry-on case handle, making it convenient to carry with your suitcase. It can be folded and stored compactly, making it useful as a sub-bag.