I have this one:
http://www.teamestrogen.com/prodFB_AER.html
Got it from TE. Very good price.
There are also these:
http://www.teamestrogen.com/search.e...ords=bento+box
I've seen one like the LG in a LBS. It's nice. You can see through the top. Plenty of room too.
It doesn't affect the ride at all. Except I am more likely to fuel properly in a group because I don't have to fumble for a gel. I keep sunscreen, food, lip stuff, and keys in here. The non-aero Fuelbelt probably has more room. But this one is fine. I keep my tools in my small seatpack.
My saddle is thin, so can't use a large bag without it flopping.