1. Pack lighter or less – max 6-7 kg all together
2. Never forget your ear plugs
3. Interrail is cool for country trip.
4. Never book a hostel bed in a mixed room anymore and be sure that the bed is in a 4 (or so) bed dormitory, not more.
5. Having your own bed linen and towels for travelling saves me money, and they are lightweight.
6. Learn your body, how it reacts to different temperatures to avoid overdressing.
7. Merino wool clothes are the best.
8. Always choose the best socks when you travel.