Translation:I want a cuter bag.
I think the meaning is different: I want more bags (that are cute) vs. I want bags that have a higher cute level
I don't think as imprecise and as dialect-specific a word as "cute" should be used in a language course.
なんで??? I think it's the most famous word from Japanese known around the world, ah ah. And it doesn't mean anything apart from "cute" so it's OK. :)