Pack lightweight, quick-dry clothing, a reliable rain jacket, waterproof footwear, insect repellent with DEET or picaridin, and waterproof dry-sacks for electronics when traveling from Miami International Airport (MIA) to Santarém-Maestro Wilson Fonseca Airport (STM) in December. Carry copies of travel documents, a small first-aid kit, and any prescription medicines—consult your doctor about recommended vaccinations before Amazon travel. December's wet-season conditions mean river transfers may be rescheduled; always confirm pickup times with lodges and allow buffer time for flight connections. Exchange some USD to Brazilian reais (BRL) in advance or at major Brazilian hubs, and consider local SIM/data plans for connectivity in the region. CTA: Prepare a December packing checklist now and verify medical and transfer arrangements before departure.