In the 1930s, a Seattle-based climbing organization composed a list of 10 essentials that every hiker should carry. High-tech gear such as cell phones and GPS units can be added to the list, but the basic items that every hiker should carry remain unchanged. Survival gear, ample food and water, navigation equipment and proper attire are necessary regardless of the terrain or duration of a hiking trip. Bring items specific to the hike's traveling conditions, such as insect repellent for bug season or an ice axe for traversing snowfields. Pack any prescriptions you're on, as well as an EpiPen if you have allergies to things like bee stings.
Nourishment
Water and food top the list of essentials for a hiking trip. Generally, you should carry at least two quarts of water per person per day. It's also a good idea to bring iodine tablets or a water filter so you can add to your water supply from sources along the route. Before entering a water scarce area, fill up your bottles. If you'll be traveling in extreme heat or uphill for a prolonged period of time, compensate accordingly by carrying extra water. As for food, pack trail mix, energy bars, beef jerky and other food that won't spoil on the trip. High-calorie foods provide much-needed energy during a hike.
Survival
If you end up hiking later than expected or having to spend the night outdoors, you'll be glad you packed a headlamp, batteries, a bivy sack and a fire starter, such as a book of matches in a waterproof case. If an accident occurs, you won't regret the weight of a first-aid kit. For repairs, wind duct tape around your water bottle or trekking poles and keep a knife or multitool handy. You should also carry a whistle or signaling device to attract rescuers if you get lost.
Attire
Weather conditions can change quickly, so hikers should carry extra clothing such as a wool hat and an extra warm layer, plus a rain jacket with a hood. Rain pants are a good idea in cool or windy weather. Extra clothing helps you avoid hypothermia if the weather turns cold or rainy. Always bring sunglasses and sunscreen. They're not just for hot and sunny weather, but to prevent sunburn in all weather and snow blindness that can come from hiking through a snowy, reflective landscape.
Navigation
A map and compass can be lifesavers if you end up losing the trail. Topological maps that indicate water sources such as streams and lakes are extremely helpful if you get lost or have to stay out for longer than expected. Before you take off on a trip, familiarize yourself with the equipment so you know how to use it. If you bring a GPS unit or cell phone, make sure you don't depend on it to the point where you'll be lost when the batteries run out.



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