I actually responded to that one
I'm looking for the small ones to make 2.5 gal batches of bigger beers on my little set up. I can't mash enough grain to do big guys, like say a barley wine.
I wanted to grab a smaller carboy and maybe age something in it, since I may be gone for a while pretty soon, and it would be nice to come back to a year old RIS, or barley wine, or anything really. Just rack, carb and go.