The Beis Mini Weekender is perfect by itself for a short trip or as an additional bag for longer trips! The trolley strap makes it great for traveling with a rolling suitcase and it fits under the seat as a personal item for air travel on most airlines (I have personal experience doing this on Delta, American, Qantas, and Aegean). The laptop sleeve, key leash, and thoughtful inner and outer pockets make it super functional for travel! The detachable bottom portion offers great extra space but has never been used in this bag.