Light weight water resistant crinkle nylon. No hassle, fits under the airline seat. Includes keychain, water bottle pockets. Black zipper pocket opens at top and bottom and can slip over a rolling suitcase handle for easy carriage. Inside is large enough for an overnight trip or it can be used as a briefcase or everyday bag as well. Take this plus the Barcelona bag for a 10 day trip. This works great as a purse.