This is a great travel bag. This is actually 2 bags. The top bag zippers to the wheeled carry on type suitcase. Each unit has back pack straps if you choose not to use the rollers. All the zippers are heavy duty! We kept the unit zipped together when moving about. Unzipped them when we boarded the airplane so we could stow one in the overhead compartment and one could be kept under the seat for easy access. The smaller backpack has all kinds of storage areas for electronics, laptops, and books. My daughter had her school books, computer tablet, Nintendo DS, cell phone, small blanket, a few stuffed animals, and some other odds and ends. Plenty of space and then there was still the suitcase part. Very nice, would highly recommend!!