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.
[header] How to pack efficiently [title] Decide what you will realistically need for your trip. [step] 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.