We would recommend that you take everything on the packing list that you can fit into your bag. Remember to follow the luggage guidelines for the airline in which you will be traveling. Most airlines allow a 50 pound checked bag, carry-on and a personal item. If the team is taking medications and medical supplies as well, there will need to be additional luggage for this; discuss this with your team leader. There are things like jackets and long pants on the list- although they sound counter productive in the jungle, you will need them when it gets cold or rainy, especially in Lima or Cusco as both are at a higher elevation and in the mountains.