I have several Gucci handbags, and I've noticed a lot of differences among them, even when they're the same style. Why do some of them have the brown dustbags with the gold gucci logo, and some have a black monogram dustbag? and why is the interior leather Gucci tag thicker on some bags than on others? I've also noticed that the beige monogram canvas can come in different shades. Some of them are lighter, some of them are darker, and some of them are a little shinier. Does anyone know why there's all these subtle differences?