The interior is lined with Ardoise chevre and it has a single zip pocket using an Hermes engraved zipper pull and an open pocket on the other aspect. The "twenty five" in its title refers to the bag's width in centimeters, rendering it the smallest while in the Birkin household. https://israelopjez.buyoutblog.com/34667067/getting-my-authenticated-luxury-bags-to-work