Luggage and bags:
As little luggage as possible. You don't need much!
Clothing/Shoes/Weather Gear: Bring a bathing suit that you don't mind getting dirty, pants for horsebackriding and to protect from mosquitos at night, flip-slop/sandals to shower in or wear during the jungle trek (you have to be able to easily take your shoes on and off when you go through the water), sneakers or hiking boots for everything else
Toiletries and Medical Supplies: toothbrush, toothpaste, toilet paper, soap, and other shower stuff if you plan on showering, LOTS of bug spray, and
don't forget your malaria pills!
Photo Equipment: bring your camera with extra batteries!
Camping/Beach/Outdoor Gear: possible a mosquito net, but it's not necessary
Luggage and bags:
It's better not to bring all your luggage because it's very damp there and everything will become damp in your bag whether you take it out or not. Just bring a small bag that you can carry around during walking treks to carry your water and camera.
Clothing/Shoes/Weather Gear: Good sandals/flip flops to wear in the shower/toilets and for trekking as well. It's recommended to bring closed shoes for the horseback riding.
I would say to bring full length pants and top to help avoid getting bitten.
Only 2 change of clothes is necessary, one for to wear during your outings and another for when you're back at camp and have washed up...don't bother bringing more clothes because you will always be dirty and so will everyone around you.
Toiletries and Medical Supplies: Goes with out saying, mosquito repellent
Photo Equipment: Most have electrical outlets so you can re-charge your batteries or bring extras with you as it's more expensive here.
Camping/Beach/Outdoor Gear: Flashflight around the campsite when it gets dark...you can't see anything!
Miscellaneous: Reusable water bottle....clean water is provided there.
Having a good binoculars would be a great asset because usually the animals/birds are too far off or are easily camouflaged. Also in my opinion, binoculars far outweigh bringing your camera...most are so worried with capturing their adventures on film then enjoying the moment.
Take a book, cards, etc to keep yourself occupied as there's lots of downtime if you go with Ecological Expedition.
You might want to bring some snacks as well to tide over between meals but I personally didn't need it.
You really need clothes that you don't care about, since they'll get very dirty!!
Toiletries and Medical Supplies: Bring everything that you need, but don't forget mosquito repellent. I ended up using something with 85% DEET but it wasn't enough. Also a lot of thicks around...
Photo Equipment: Film and tripod, since the place has no shops or anything...ehi this is Pantanal!!
For sure the hammock! It may be the most important thing after the mosquito’s repellent, which is of a great sense and it requires attention if you have not made the necessary vaccines.
Toilet paper also needed, unless you don’t mind using the long and flat green leaves, which are abundant in the area.
Not to forget is your swimming suit for that nice bath in the lake as there is neither running water nor soap.
I suggest you carry also with you one of those Swiss knifes, which in many cases are very useful. One good sun protection lotion, because in case of summer, the 40C will burn you off for sure. One rain coat is also good to have, because in case of rain there is no place to hide
The mosquitoes, mainly during the evening/night, are very annoying, so it is a good idea to bring with you a mosquito’s net. Ah! Not to forget a binoculars, very important for those who wishes to see closer the extraordinary animals as “Capivara” or bird watching the 500 species of this place.
A very good shoes,specially for long walks and dificult areas,prefencially high boots,because of the mud!!
Toiletries and Medical Supplies: First aid box are always present on boats or as part of the guides equipment,repelents are recomended(!!),something for diarheia just in case.
Miscellaneous: A hat!!!