I have a Plano rear cargo box I got from Cabela's.
Likes: Not to big, or tall. Big enough in the middle, the wife can sit there comfortably (with a pad behind her back).
Dislikes: Doesn't come out flush with the sides of the back rack. Is kind of thin compared to some others. Has chrome hinges, hinge rod, & lock brackets. Wish it was about 2" taller.