How to Pack for High Altitude Trekking in Peru

Pack in layers focusing on moisture-wicking base layers, insulating mid-layers, and waterproof outer shells. Bring altitude sickness medication, high SPF sunscreen, and a quality sleeping bag rated to 20°F. Your gear needs to handle temperatures from 70°F in valleys to below freezing at altitude.

  1. Start with your base layer system. Pack 3-4 merino wool or synthetic base layer sets. Avoid cotton completely. Bring long-sleeve shirts and thermal bottoms that wick moisture and dry quickly. The temperature can swing 40 degrees in a single day.
  2. Add insulating mid-layers. Bring a fleece jacket or down vest for warmth, plus a puffy jacket for camp and early mornings. Pack one lightweight fleece and one heavier insulation piece. You'll layer these based on conditions and activity level.
  3. Choose your outer shell carefully. Pack a waterproof, breathable rain jacket and rain pants. Peru's weather changes fast at altitude. Look for pit zips and good ventilation. Your shell needs to fit over all your layers.
  4. Pack altitude-specific medications. Bring acetazolamide (Diamox) for altitude sickness prevention, ibuprofen for headaches, and any personal medications. Start taking Diamox 1-2 days before ascending above 8,000 feet. Consult your doctor before the trip.
  5. Prepare for intense UV exposure. Pack SPF 50+ sunscreen, lip balm with SPF, glacier glasses, and a wide-brimmed hat. UV radiation increases 4% for every 1,000 feet of elevation. You'll burn faster than you think, even on cloudy days.
  6. Choose the right sleeping system. Bring a sleeping bag rated to at least 20°F (-7°C). Add a sleeping pad with high R-value (4.0+) for insulation from the cold ground. Consider a liner for extra warmth and easier washing.
How much should my pack weigh for Peru trekking?
Keep your pack under 20% of your body weight. For most people, that's 25-35 pounds including water. Porters can carry camping gear on organized treks, letting you focus on personal items and day essentials.
Can I buy trekking gear in Cusco instead of packing it?
Yes, but quality varies widely and good gear is expensive. You can rent sleeping bags and find basic clothing, but bring critical items like proper boots, medications, and base layers from home.
What's the most important piece of gear for altitude?
Your layering system. Temperatures change drastically throughout the day and as you gain elevation. Being able to add or remove layers quickly keeps you comfortable and prevents overheating or hypothermia.
Do I need special boots for Peru trekking?
Waterproof hiking boots with ankle support are essential. Break them in completely before your trip. Many trails are rocky and wet. Consider bringing gaiters to keep debris and water out of your boots.