Article in English: Oftentimes a sunny day at the start of your hike can turn into severe  weather by the end. Depending on the season, the weather could change to hail, thunder and lightning, a snowstorm or high winds. Pack a waterproof  windbreaker that can easily be rolled up and accessed. From fall to  spring, consider bringing thermals and a down jacket to keep you warm and dry. When going backpacking  overnight or on a long day hike, it’s important to not pack too much so  that you are weighed down. Instead, pack only what you need. Wear clothes that dry quickly and are lightweight. Clothes, like down jackets, that are warm and can be stuffed into a small ball are great. Layering is key when it comes to backpacking. Fleece is a good material for vests and jackets--it is warm and dries quickly.  If you are backpacking in an area that gets cold, make sure to bring gloves, warm socks, and a hat. Always pack an extra pair of socks. Wet socks make for miserable hikers. Keep the extra pair easily accessible and change socks during the day if they get damp from perspiration to avoid blisters. Look for foods high in fiber, protein and good fats to boost and maintain your energy  level. Mixed nuts, dried fruit, beef jerky, and even tuna with crackers are some great options to replenish your electrolytes lost from  sweating. Outdoor activity stores sell dehydrated meals that are lightweight and perfect for backpacking. All you need to do is add hot water.  Eating a handful of nuts before bedtime can  actually help to keep you warm throughout the night. If you  are absolutely sure that a water source will be near where you are hiking to, only  bring enough water to get to that point along with your water purifier. There are quite a few things you should bring with you when you go backpacking because something unexpected is always bound to happen. Essential items include:  Tools to help you figure out where you are. These include  a map of the area, a GPS, and  a compass.  A headlamp or flashlight to help you see at night. You should...

Summary in Chinese:
为气候变化做准备。 少带物品。 带上正确的食品。 带上露营必备物品。 打包防晒的物品。