Instead of having two regular seats, the Caboose is a tandem stroller - the back seat is a bench seat and faces the back. The backseat is meant for kids 2 1/2 and up. (Well up to 45lbs). Caleb's almost 2 1/2. The bar that holds the infant carseat in place can be removed and there is a cupholder bar that can be put in its place when Annalise is able to sit up.
It also has a standing platform so the back kid can stand and face forward. Caleb REALLY likes this stroller. We went for a walk and he couldn't decide which way he wanted to face!
The back bench seat has a 3-point harness, so Caleb can be restrained if need be :) handy! The bench slides back and forth to give access to a storage bin underneath. The wheels are just as maneuverable as my Graco MetroLite (which I really liked as a single stroller) and they weigh about the same. These pictures compare the Ultralight Caboose with the orignal caboose.


The Ultralight has a much larger shade and covers the back child well. I thought that would be extremely helpful since we live in south Florida - otherwise I might have purchase the original. However, I test drove an original caboose at a store and the Ultralight does drive better. Cost difference? About $75-$100 depending on where you buy it.