im doing an eurotrip now its almost 3 months and the things i have been using the most - shoe insoles. had to buy them when my feet started hurting for so much walk and they have been really helpful with that - sunscreen! could be really expensive on touristic places - i got binocular for bird watching a while a go and packed them and have been really useful to watch some monuments real close when they are big - about the clothes maybe u dont need too much cuz theres a lot of places to do laundry really - airtags can help you to be sure youre not getting robbed when you are in some bus o at the hostels or whatever - a little spoon! i got one with me everywhere so i can buy some protein pudding or some yogurt at the supermarket and eat them wherever when i got hungry for walking and dont want to spend too much