Next is the insulating layer in the form of a fleece jacket and pants. In the summer, this is stored in a pack until needed. Also stored away is the last layer, called the protection layer. Consisting of a jacket and pants, it shields the body from wind and precipitation. When using the three-layer system, keep your body at a comfortable temperature by adding and removing layers.
People dehydrate quickly.
A water pack with a straw extending toward the mouth makes drinking easier. For food, Anderson suggests lots of complex carbohydrates, the high-octane fuel source for the human body. A breakfast consisting of cereal, juice, fruit, and toast gives a kick start. Pack more carbohydrates for lunch, such as crackers, bread, low-fat granola bars, dried fruit, and string cheese. They digest slower and make you feel sluggish.