I know it is not really considered gear but found this book in a charity shop recently and it cost less than a dollar, think it was a great find. I firmly believe knowledge is the best peice of gear to carry with you as once learned it weights nothing. This book The SAS Survival Handbook -- John Wiseman | bidorbuy.co.za It covers many topics from what you should always carry like the essentials to strategy. Also explaning climate & terrain, hunting, food, what to avoid, shelter making, traveling, health, survival at sea, rescue and so forth. Bascially most of what you need to survive and how to make it from natural elements.