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 after my daughter asked me to make one, it became popular, and now both of my daughters and my wife use them. I am 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 is sufficient for most items that won't cause the bag to lose its shape, and it is very useful. (This thickness is sufficient for this size, but if you prefer two layers, please purchase the separate 2-piece set. We also offer a thicker 1.0mm version.) Also, because it is milky white, you can easily find coins or other small items that fall to the bottom. Since it is handmade, there may be slight imperfections, but it is finished to a practical standard. Also, there may be linear scratches that appear to be from the PP material creation 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