Do I really need to buy expensive gear?

You need high-quality layers, but you don't need the most expensive brand. Prioritize your boots and your waterproof shell; these are the two items that will keep you safe and comfortable.

How do I handle the cold at night?

Bring a sleeping bag liner. It adds about 5-10 degrees of warmth to your sleeping bag and keeps it clean, which is essential when you cannot shower for days.

How to pack for trekking in the Andes

Pack for four seasons in a single day by utilizing a three-layer system: a moisture-wicking base, an insulating mid-layer, and a waterproof, windproof shell. Prioritize high-quality, broken-in footwear and sun protection, as the high altitude intensifies UV exposure significantly.

Master the layering system. Bring a synthetic or merino wool base layer (never cotton), a fleece or lightweight down jacket for warmth, and a high-quality hardshell jacket that is both waterproof and wind-resistant. You will be peeling these off and putting them on hourly.
Select your footwear. Bring mid-cut hiking boots that you have walked at least 30 miles in before the trip. Ensure they are broken in to prevent blisters, which can end a trek prematurely at high altitudes.
Account for altitude sun. The sun is significantly stronger at 3,000+ meters. Pack a wide-brimmed hat, high-SPF sunscreen (at least 50), and polarized sunglasses. Snow blindness and severe sunburns occur much faster here than at sea level.
Organize with dry bags. Use internal dry bags for your clothes and electronics inside your pack. Even if your backpack has a rain cover, Andean storms can soak through gear during long days of trekking.

Do I really need to buy expensive gear?: You need high-quality layers, but you don't need the most expensive brand. Prioritize your boots and your waterproof shell; these are the two items that will keep you safe and comfortable.
How do I handle the cold at night?: Bring a sleeping bag liner. It adds about 5-10 degrees of warmth to your sleeping bag and keeps it clean, which is essential when you cannot shower for days.