Packing for High Altitude in the Andes
Pack for rapid temperature swings by using a four-layer system and prioritize high-SPF protection and hydration gear. Because oxygen is thin and the sun is intense, your goal is to regulate body heat efficiently without overloading your pack.
- Adopt the four-layer rule. Bring a moisture-wicking synthetic or merino wool base layer, a lightweight fleece mid-layer, a down or synthetic insulated jacket for cold nights, and a high-quality windproof/waterproof outer shell.
- Protect against high-UV exposure. Pack polarized sunglasses with high UV protection and a wide-brimmed hat. The atmosphere at 3,000+ meters is thinner, meaning you can sunburn in under 20 minutes.
- Manage hydration gear. Carry a 2-liter hydration bladder for your daypack and a separate 1-liter insulated metal bottle for evening hotel use. Hydration is the single best way to mitigate altitude sickness symptoms.
- Prepare your medical kit. Include Ibuprofen for altitude headaches, electrolyte packets (like Liquid I.V.), and lip balm with SPF 30+. Speak to your doctor about Acetazolamide (Diamox) if you are traveling above 2,500 meters quickly.
- Do I really need a heavy down jacket?
- Yes, if you are traveling above 3,500 meters. Temperatures can drop below freezing at night, even in the middle of a sunny day.
- Can I just buy gear when I arrive in Cusco or La Paz?
- You can find alpaca wool items easily, but technical gear like high-SPF sunblock, specific medications, and reliable windbreakers are often more expensive or harder to find in local markets. Bring your core technical kit from home.