Dress up your Miche Prima Base Bag with a beautiful outer "shells" to match your outfits, your event or your personality. The magic of the Miche Prima Bag is you can change your look by changing your shell as often as you want without ever having to disturb or move the contents inside your Prima Base Bag. To add or change your shell, simply insert the Prima Base Bag into the Prima Shell of your choice, fold the shell's two long side flaps over the sides of the base bag and the shell is now held in place by strong, earth-friendly magnets hidden in fold-over flaps. (The magnets are also credit card safe.) Once you've selected your Shells, check out our handles in various styles and colors to complete your look.