For more than 10 years, the "SAS Survival Guide," a compendium of outdoor tips by John "Lofty" Wiseman, has been a staple in my camping backpack. The 400-page handbook usually comes with me on camping trips and has helped me forage for berries or navigate by sun and stars. Whenever I fly, I leave the book on its perch by the bed, which, of course, renders it useless.