Packing is one of those essentials for a successful trip/trek, but one that can cause apprehension when planning for the new or unknown. Therefore, we have created a generic packing list for the treks and day excursions along with some helps, hints, and links. Remember MAP airlines from Manaus to São Gabriel allows only one checked bag at 23 kg (50 lbs) and one carry-on at 5 kg (11 lbs). Also, we will offer a packing orientation in SG before your trek to make sure that your pack is ready for the hike.
WHAT AMAZON TRAILS PROVIDES:
First Aid Kit
inReach Emergency communicator device
Silverware, cups, plates
Let’s take a look at the three largest and priciest gear items. Backpack, boots, and hammock.
GUIDELINES FOR CHOOSING AND LOADING A PACK:
Capacity: The number in the pack’s name refers to the pack’s volume in liters.
A common size for weekend trips (1–3 nights) is 35–50 liters.
Multiday trips (3–5 nights) require packs of 50–80 liters. So, the best overall pack would be a 50 or 60 liter pack.
Size: Backpacks are sized according to torso length, not a person’s height. You can get a friend to measure your torso length, determined by measuring the distance between the top of your hips to your C7 vertebrae—that bony protrusion near the base of your neck.
Loading and adjusting a pack: A backpack is designed to carry most of the load on your hips while your shoulders carry less. Keep heavy gear close to your back and near your shoulders.
Useful site - http://www.outdoorgearlab.com/Backpacks