Here is a baggage checklist that I’ve been using for a few years

Backpack or luggage

1. Backpack
2. Samsonite (55-45-20) suitcase

Documents

1. Passport
2. Pen and photos for Visas
3. Cash

Clothing and shoes

1. T-shirts
2. Socks
3. Underwear
4. Hoodie
5. Trousers
6. Shorts
7. Flipflops
8. Tracking shoes
9. Sandals
10. Rain jacket/Umbrella
11. Swimming shorts
12. Pijamas
13. Towel

Accessories and Electronics

1. Power adapter
2. USB charger
3. USB cable
4. Mac charger
5. Headphones
6. Spare phone with for regional sim
7. Sunglasses
8. Buff
9. Knife or scissors
10. Snacks and Tea ;)

Medicine and Toiletries

1. Toothbrush and toothpaste
2. Deodorant and perfumes
3. Comb
4. Handcream and Suncream
5. Plasters/bandage
6. Contact lenses
7. Ibuprofen
8. Tissues
9. Mosquitoes repellent
10. Soap/Shampoo