Raincoat, nylon bag, lighter... are essentials in your backpack for winter exploration.
Raincoat: For adventurers, this gear not only works when it rains, but also keeps you warm effectively, lightweight, and convenient for movement.
Scarf helps keep your neck warm and doubles as a blanket or cover during sleep.

Hair dryer serves multiple purposes such as drying hair, clothes, masks, gloves, electronic devices...
Medicine for common illnesses: Moving around in cold or rainy weather can make you prone to illness or weaken your immune system. You should carry some types of medicine for common illnesses such as cold medicine, cough syrup, fever reducers, and a few effervescent vitamin C tablets. Additionally, cotton, gauze, urgo, ginger oil, and salonpas should also be in your kit.
Warm clothing: Prepare a jacket that can both keep you warm and resist water if you're trekking in winter. A snug-fitting sweater also helps ward off cold very effectively. You'll also need to pack wool scarves, ear warmers, thick socks...

Moisturizing cosmetics like lotion, lip balm will prevent discomfort from dry skin or lips. If you're worried about these items taking up too much space in your backpack, you can opt for travel-sized sets.
Multi-purpose knife with functions such as opening cans, cutting wires, peeling fruits... will be a handy tool in many situations.
Lighter helps you light up a camping stove, cook food. In some bad situations, a lighter can also help you signal for help.
Camera protective bag and moisture absorbers are indispensable items.
Nylon bag helps you organize your belongings better, protecting them from getting wet from rain or dew.
GPS device helps you determine your direction of movement in situations like fog or heavy rain obstructing visibility. No matter how familiar the trekking point is, in such situations, you can still easily get lost.
According to Zing News
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Reference: Mytour Travel Guide
MytourDecember 11, 2015