I travel for work and this is a must have! I keep almost ALL of my clothes for a 5 day business trip in this, including pajamas, socks and underwear. It has a pocket that fits pens, 1" binders etc.
This fits easily in the overhead compartment and has a strap to attach to a telescoping handle on a rollie suitcase (because it does get heavy!). My rollie hold my toiletries, makeup, hair products and miscellaneous odds and ends.