Forbes travel writer Lois Alter Mark offers a gift guide for frequent fliers who want to shop with heart. She curates a list of packables--everything from underpinnings to portable slow cookers!--from companies who give back to the globe. Find something for the travelers in your life, and you'll be giving twice! Don't forget to treat yourself--a pair of cute compression socks, perhaps? When it's a gift that does good, no guilt is necessary!