How to Pack for the Andes Mountains
Pack in layers for extreme temperature swings, prioritize high-altitude gear like sunglasses and sunscreen, and bring both waterproof and insulating layers. Your pack weight matters more at altitude—every ounce counts when you're breathing thin air.
- Start with base layers. Pack 2-3 merino wool or synthetic base layer sets. Cotton kills in the Andes—it stays wet and loses insulation. Merino wool regulates temperature and resists odor for multi-day trips.
- Add insulating layers. Bring a down jacket rated to at least 20°F (-7°C) and a fleece or wool mid-layer. Down compresses small but loses warmth when wet, so pack it in a stuff sack with a dry bag.
- Pack waterproof outer shell. A breathable rain jacket and waterproof pants are non-negotiable. Weather changes fast at altitude. Look for 3-layer Gore-Tex or similar—2.5 layer shells work for day hikes but not multi-day treks.
- Protect against UV exposure. Pack SPF 50+ sunscreen, zinc stick for nose/lips, glacier glasses (category 4), and a wide-brimmed hat. UV exposure increases 10-12% per 1,000 feet of elevation. Snow and rock reflect 80% more UV than sea level.
- Choose appropriate footwear. Waterproof hiking boots with ankle support for trekking, plus camp shoes (lightweight sandals or slip-ons). Break in boots for 50+ miles before your trip. Bring gaiters to keep rocks and snow out.
- Pack altitude-specific items. Altitude sickness medication (consult your doctor), electrolyte tablets, and extra water capacity (4+ liters). Dehydration happens faster at altitude. Pack a headlamp with extra batteries—days are shorter near the equator.
- Can I rent gear instead of buying?
- Yes, major trekking hubs like Cusco, Huacachina, La Paz, and Quito have rental shops. Quality varies—inspect everything carefully. Expect to pay $15-25 per day for a full gear package. Buy your own base layers and socks for hygiene.
- How much should my pack weigh?
- Aim for 20-25% of your body weight maximum. At high altitude, every extra pound matters. A 150-pound person should carry no more than 30-37 pounds including water. Porters can carry gear on organized treks for $30-50 per day.
- What's different about packing for the Amazon side versus Pacific side?
- Amazon side (eastern slopes) gets more rain year-round—prioritize waterproof gear and quick-dry fabrics. Pacific side (western slopes) is drier but has bigger temperature swings—focus on insulating layers. Both sides need serious UV protection.
- Do I need special sleeping gear?
- Yes if camping. Sleeping bags rated to 10°F (-12°C) minimum, and a closed-cell foam pad plus inflatable pad for insulation from cold ground. Temperatures can drop 40°F from day to night even in summer.