Here's a checklist to consider while backpacking for a tour:

1. **Essentials:**

   - Passport/ID, visas (if traveling internationally)

   - Travel itinerary and tickets

   - Cash and/or credit/debit cards

   - Travel insurance documents

   - Emergency contact numbers and addresses

2. **Clothing:**

   - Lightweight, quick-dry clothing suitable for the destination's climate

   - Comfortable walking shoes or hiking boots

   - Swimwear (if applicable)

   - Hat, sunglasses, and sunscreen

   - Rain jacket or poncho

   - Extra socks and underwear

3. **Gear and Accessories:**

   - Backpack or travel bag

   - Daypack for day trips and excursions

   - Sleeping bag or sleeping sack (if camping/hosteling)

   - Travel pillow and earplugs

   - Portable charger/power bank

   - Travel adapter and/or voltage converter (if traveling internationally)

   - Flashlight or headlamp with extra batteries

4. **Health and Hygiene:**

   - Personal medications and prescriptions

   - First aid kit with bandages, antiseptic, pain relievers, etc.

   - Toiletries (toothbrush, toothpaste, soap, shampoo, etc.)

   - Hand sanitizer and wet wipes

   - Personal hygiene products (feminine products, razor, etc.)

   - Insect repellent and mosquito net (if traveling to mosquito-prone areas)

5. **Technology:**

   - Mobile phone and charger

   - Camera or smartphone with camera

   - Travel apps (maps, translation, currency converter, etc.)

   - Portable Wi-Fi hotspot (if necessary)

6. **Documents and Copies:**

   - Copies of passport/ID, visas, and travel insurance

   - Printed or digital copies of itinerary, hotel reservations, and important contacts

7. **Miscellaneous:**

   - Travel journal and pen

   - Travel guidebook or maps

   - Snacks and reusable water bottle

   - Multi-tool or Swiss Army knife (pack in checked luggage if flying)

8. **Optional:**

   - Travel pillow and blanket

   - Entertainment (books, e-reader, playing cards, etc.)

   - Zip-lock bags or dry bags for wet clothes or toiletries

By considering these items, you can ensure a smooth and enjoyable backpacking experience on your tour.