Do I need to bring a change of clothes for a two-day 1 night tour? Slippers or something? What else do you need to bring? ⊙?

You don't need to bring a change of clothes, and you will come back the next day after a two-day tour; Not to mention slippers. The hotel provides disposable slippers, bring something to eat on the way, apples, bread, sausages (the kind in small packages) and some money. Your bag is quite good, no one will make fun of it. As a reminder, try not to buy things in tourist areas (except large supermarkets).