Pack a small towel, as it is useful for drying off at beaches, on picnics, or elsewhere. Buy a small backpack around 35-40 liters to force yourself to pack lightly. Take half as many clothes as you think you'll need, and pack only essential items by making a list and cutting it in half. Be sure to pack extra socks, as some will get lost or worn out. Bring an extra bank and credit card as a backup in case of loss or theft while traveling. Use cards without foreign transaction or ATM fees to avoid unnecessary costs over an extended trip.