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How to pack efficiently
Decide what you will realistically need for your trip.
Write each item out in a list to help you visualize the contents of your pack. Think about where you're going, how long you'll be gone, and what you need to maintain a comfortable quality of life while you're on your trip.
If you're not absolutely sure that you will need something, consider leaving it behind. Unless you're traveling somewhere especially remote, you'll be able to buy most non-essential or emergency items while you're on your trip.