Tours often involve varied climates and activities, so aim for practical pieces and pack only what you can comfortably manage. Most tours suit light, comfortable and versatile clothing.
Consider breathable layers, good-quality walking shoes, a hat, sunglasses, sunscreen, evening attire for select dinners, a reusable water bottle, a portable charger, any medication you might need, travel documents and destination-specific essentials.
Remember to adhere to airline guidelines on baggage limits, liquid limitations and declaring medications.