This is a handmade randoseru (Japanese school backpack) cover. The size fits the lid of a randoseru measuring 48 x 26.5 cm. It is possible to shorten the length. Adjusting the width is not possible. It can be secured with both elastic and ties. It can be attached even if there is no metal fitting to hook the elastic between the shoulder straps. Since it is made of laminated fabric, it is fine to simply wipe it if it gets a little wet from rain. However, if water seeps through to the lining, please remove it and dry it. We have a small amount of fabric in stock, so please leave a comment if you would like a size change. This is a fabric I really liked, but I felt it would be a waste to just keep it in my collection, so I am selling it as a randoseru cover. If you like it, please consider purchasing it. As this is a handmade item by an amateur, please refrain from purchasing if you are looking for a perfect product like those sold commercially.