1. Always pack a small towel as it is useful for drying off at beaches, on picnics, or elsewhere, and hostels do not always provide them. 2. Buy a small backpack around 35-40 liters to force packing light and avoid overpacking. Humans tend to fill available space. 3. Pack lightly, taking half the clothes you think you need. Make an essentials list and cut it in half. A small backpack limits extra items. Bring extra socks as some will get lost or worn.