Even when I’m not hiking, it’s good to pack a backpack, one that’s small, light, waterproof and very collapsible. It’s perfect for carrying a water bottle, rain jacket, lunch or snacks and other items if I decide to rent a bicycle in a city, or do some light hiking. It works to carry a book, umbrella, hat, or sunscreen if I’m strolling around town, visiting museums and shopping. I just discovered a backpack that fits these criteria. The Backpack FreeFly16 is produced by Matador. It’s so small when rolled into its storage bag that it fits into the palm of your hand. (Because I don’t check luggage, this backpack easily slips into my carry-on.) It barely weighs five ounces. The shoulder straps are breathable so you don’t feel sweaty in summer heat. And even in a drenching downpour, it’ll keep the rain out. It has one main zippered compartment, and a much smaller one that's ideal for a notebook, pens and other ancillary items.