Though my bag may be cheaper than Lucas’s, it is bigger and more attractive.

Lucas’s bag might be more expensive than me but it is not so big and attractive as mine.

Lucas’s bag may be more expensive than mine but it is not bigger and attractive than mine.

Lucas’s bag may be more expensive than mine but it is not as big and attractive as mine.

Lucas’s bag might be more expensive than me but it is not bigger or more attractive than mine.