Pack a small towel, small backpack, extra socks, and extra bank/credit cards when traveling. A small towel is useful for various situations and won't add much weight. A small backpack around 35-40 liters forces packing light to avoid overpacking. Take half as many clothes as planned and pack extra socks as some will get lost or worn out. Bring backup bank/credit cards in case of loss or issues with primary cards to avoid being without access to funds.