Roomy enough to hold all the essentials — lunch, book, rain jacket — this shoulder sling sack is ideal for all kinds of active jaunts. Its mesh side pocket keeps your water bottle handy, and two zip pockets keep keys and wallet from getting buried. The shoulder strap contains a convenient pouch for an iPod or cell phone, and the waist belt keeps your pack in place during longer strolls — or runs for the bus. Constructed from water-repellent nylon rip-stop fabric, it stows down into its own pocket, making it easy to bring along on trips or as an extra bag when you’re out treasure hunting. $59 from Patagonia (www.patagonia.com).