1. Always pack a small towel that won't take up much space in your backpack, as towels are useful for drying off at beaches, on picnics, or elsewhere and may not always be provided. 2. Buy a small backpack around 35-40 liters to force yourself to pack lightly and avoid overpacking. Extra space tempts people to pack more than needed. 3. When packing, take half the clothes you think you'll need since you can wear items multiple times, and write a packing list and only bring half of what's on the list since you'll have limited space in your small backpack.