Copies of documents. It is always a good idea when travelling internationally to make copies of such things as the informational page of your passport, airline tickets, or other important documents, and keep them separate from the originals. Field gear and bedding. Cotton clothing is best for the rainforest. You should have pockets on pants and shirts.
Blue jeans are a poor choice for the forest, but OK for day hikes or Quito.
Plan on wearing the same field clothes for 4-5 days. Daytime temperature dictates short sleeves, but wear long sleeves at night. Shorts are not a good idea in the forest at any time, but are fine for lounging in cabins or working in the lab or library. Laptop computers typically have the screen display fail. Most radios and tape players survive pretty well.