The Suitcase Substitute

Pros: Ultraportable, lightweight, easier to run between gates with than traditional suitcases, low likelihood of being forced to gate check due to crowded overhead bins
Cons: Less useful in maintaining personal hygiene.
Verdict: The numbers are clear - pros out number cons.

Today's disgruntled rant proudly brought to you by Continental Airlines and the ground staff at Newark airport who wanted us to stop over a little longer (aka 24hrs) en route to Madrid.