Our backpacking list will contain:

map

sunglasses

couple pairs of pants

a few T-shirts

a Flashlight and some batteries

probably a first aid kit

matches

waterproof container

knife

credit cards

money

socks

underwear

1 water bottle in each pack, since we can buy some more at local stores

Wicking T-shirt (synthetic or wool)
Wicking underwear
Quick-drying pants or shorts
Long-sleeve shirt (for sun, bugs)
Sun-shielding hat
Bandana or Buff

passports

shoes

a stick

toiletries

Insect repellent

Watch

Notebook/pencil

Duct tape 

Hiking shorts & t-shirt 

swimming clothes

Water container(s) & water

Rope

and of course a backpack