#2 Pencil and Waterproof Notepaper 2 pieces 2.125 x 3.667 inches (5.4 x 9.3 cm), leave notes, memory aid, keep log Whether leaving a message for rescuers, writing yourself a note so you don’t forget something critical, or for keeping a log of your experience, it is a lot better if the paper doesn’t turn to mush if it gets wet