Thank you for your interest in our popular Longchamp Le Pliage S size inner base. This is a handmade item. My specialty is woodworking, but I made these at my daughter's request, and they were well-received. Now, both of my daughters and my wife use them. I'm offering them at a low price so that everyone can use them. Made of 0.75mm thick PP sheet. (Matte or glossy finish, depending on material availability.) The corners are rounded to prevent scratches on the bag. It's sufficient for most items, unless they are extremely heavy and likely to cause the bag to lose its shape. (This thickness is sufficient for this size, but if you prefer two layers, please purchase the separate set of two. We also offer a 1.0mm thick version.) Also, the milky white color makes it easy to find coins or other small items that may fall to the bottom. As this is a handmade item, there may be slight imperfections, but they are within the acceptable range for practical use. Also, there may be some linear scratches that appear to be from the PP material manufacturing process, please understand. The size is based on my own bag (Longchamp Le Pliage S size, model number 1621, bottom size approximately 22 x 14 cm). Just to be clear... the bag is not included. Thank you. Instant purchase OK * For an additional 100 yen, we can ship via anonymous delivery (Yu-Packet Post). Please let us know in the comments before purchasing.