what does the exterior feel like?
Since it is glittery, does it feel scratchy and does the glitter come off when rubbed?
Or is there a plastic lining around the glitter?
No not at all! It's only glittery on the outside and it's smooth. Kind of like leather or what you said with the plastic lining lol so no glitter comes off either. The inside is padded! I love it! Protects my Mac well. No scratches from glitter.