You can check out my old bag that I used in the first 18 countries.

PIC

Big touristic bag 60 l + rain bag
Small touristic bag 18 l
Yoga mat + shirts x2 + pants x2 + gloves + small towel

Clothes, shoes

1. Winter coat

2. Trekking shoes (Quechua)

3. Sandals

4. Black cap

5. Jeans + belt

6. Brown sport pants

7. Shorts x2 (black, colorful)

8. T-Shirts x5 (black, black, blue, red, white)

9. Black sweater

10. Blue sweater

11. Underwear x4 (Hush Puppies)

12. Socks x5

13. Bandana (blind fold)

14. Rain poncho

Toiletries

1. Compact touristic towel

2. Toothbrush, toothpaste

3. Soap x3

4. Body scrubber

5. Small bottle of shampoo

6. Deodorant x5

7. Electro razor

Documents

1. Passports

2. Wallet with cards and money

3. Keys

First Aid Kit

1. Mini first aid kit

2. Plasters

3. Nail clippers

4. Earplugs

5. Thread x2 (white, black), needle

6. Scissors

7. Analgin x20

8. Activated charcoal x2

9. Hygienic lipstick

10. Cotton sticks

11. Betadin (for scratches), bandage

12. Contact lens, tweezers, natural tear

Electronics

1. Kindle, charger, case

2. iPhone, charger

3. iPad, charger

4. Airpods

5. Apple earphones (backup)

6. HyperX headphones, adapter, bag

7. Swatch watch

8. An outlet (4 sockets), universal adapter

9. Power bank x2, charger

10. WLE set: tripod, notebook, Parker pen, A4 paper

Other

1. Black belt bag

2. Black/green shoulder bag

3. Small lock, keys

4. The Prayers

5. Neck pillow

6. Eyeglasses

7. Pens x2

8. Touristic hooks

9. Sandwich bag

10. Head flashlight

11. Water bottle 0.5 l

12. OPTI-MEN x2