I needed a backpack that would be small enough to fit under my airline seat, but large enough and light enough to carry extra items I needed since all I would have would be a carry-on for a two week trip to Europe. One thing I wanted was pockets on the outside for important items so I wouldn't have to go into the bulk of the backpack while traveling. The zippers are metal and operate nicely. I love the striped interior and the backpack itself has lots of wonderful pockets inside without being overwhelming. In addition it has an USB port and room for a 15.6 inch laptop! It also has a strap on the back to fit over the handle of your luggage and a zipper in the back that's against your back for protected items like a passport. You get all this for an incredibly good price. To top it all off, it's very good looking and will match my luggage perfectly. You just cannot go wrong with this backpack. I am extremely pleased with its quality and functionality. I can't wait to take it on my trip.