Dr. Bronner's Pure Castille Liquid Soap

You could pack an entire toiletry bag's worth of liquids for your hair, face, and body or you can embrace the liquid magic. Dr. Bronner's magic all-one soap is good for your skin, hair, and teeth and can also serve as a laundry detergent. Because a little of it goes a long way, a couple of ounces lasts a couple of weeks. You're skin will get a bit dry, but you'll deal with it. [$10.50 for 16 oz; drbronner.com]