Everyone should know some basic “rules” when hiking in the grat outdoors Gather knowledge where you plan to be and be prepared! Whether you’re a rock climber, hiker, backpacker or serious mountaineer certain supplies will almost always become a necessity, especially in critical situations. Even less critical situations require attention and can only be addressed if proper planning and preparations have been made. Whether you are on a day hike or a week long trip, there are supplies that are absolutely essential to your safety.