I use this bag for trips of 2-4 days. The size is large enough that I can fit all my stuff in for that length of time with ease. However, it's small enough that it fits in the overhead bins easily (laying on it's back, handle pointed towards aisle). It's very sturdy and has a number of little pockets to put stuff I want to access easily. The pull out handle is sturdy, slides easily, locks solidly, and is a comfortable length for pulling (I'm 6' tall). Very highly recommended.