What's in My Daypack for Humantay

My kitchen table at 2:50 AM: one 22-litre pack, a headlamp with teeth marks from the year I kept it in my mouth while tying boots, and the same dozen items I have packed hundreds of times since I started guiding this valley in 2022. People imagine a mountain guide's bag is full of technical mysteries. It is not. It is full of boring things chosen by cold mornings and burned necks, mine and other people's. Since visitors ask me at least twice a week what to bring, here is the honest inventory, item by item, plus what I deliberately leave in the van.

The layer system that actually survives the day

Three layers beat one thick jacket every time: a wicking base, a warm mid-layer, and a wind and rain shell. The day swings from around freezing at dawn to roughly 10 to 20 C in full sun and back to raw wind at the shore, so you will put on and peel off layers constantly.

The single biggest packing mistake I see is the one-big-coat strategy. Someone boards the van at 3:40 AM in a huge parka, roasts in it at breakfast in Mollepata, ties it around their waist on the climb, and then has nothing adaptable when the wind comes off the glacier at the top. The day is not cold or hot. It is both, several times, in a fixed sequence you can plan for.

My own system: a synthetic base layer that dries fast when the switchbacks make me sweat, a fleece I wear at dawn and at the shore, and a shell that handles both wind and the surprise showers this valley produces even in the dry months. Trousers that move, never jeans; wet denim at altitude is misery with a belt. On my head, a wool hat for the two cold ends of the day and a brimmed sun hat for the middle. The listing for the featured departure tells you the same in fewer words: hiking shoes, warm layers, rain gear.

Here is how the sequence actually plays out against the clock, with the temperatures I genuinely experience up there:

Moment of the day	Conditions	What I am wearing
3:40 AM, Cusco pickup	Cold, dark, ~3,400 m	All three layers, wool hat
6:30 AM, Mollepata breakfast	Cool valley morning	Fleece off, shell on
8:30 AM, trailhead (~3,850 m)	Near freezing to brisk, can be -1 C early	Base plus fleece, gloves
10:00 AM, climbing in sun	Warm work, strong sun	Base layer only, sun hat
10:45 AM, the shore (~4,200 m)	10 to 20 C but raw glacier wind	Fleece and shell back on
1:30 PM, walking down	Warmest slice of the day	Base layer, sunscreen refreshed

Sun at 4,200 metres is a different animal

The UV index around Cusco regularly hits 11, the extreme band, and UV intensity climbs roughly 10 percent for every 1,000 m of altitude. At the lake you are more than 4 km above sea level, often above thin cloud that burns you anyway. Broad-spectrum SPF 30 or higher, reapplied, is non-negotiable.

This is the section I wish every visitor read twice. Peru's weather service publishes UV forecasts for the highlands that sit in the very high to extreme range as a matter of routine, not exception; you can check the current map on SENAMHI's UV radiation page. Add the altitude multiplier, roughly 10 percent more UV per 1,000 m, and the arithmetic for a shoreline at 4,200 m gets ugly fast. The burns I see most are not from cloudless days. They are from overcast mornings, because people feel cool air and skip the sunscreen while the UV sails straight through the cloud.

So in the pack: broad-spectrum SPF 30 plus, in a small tube I can reach without stopping, applied before the trailhead and again at the shore. Real sunglasses, the kind that block properly, because glacier light bounces off water and pale rock into your eyes from below. The brimmed hat earns its place here too. Ears, neck, and the backs of hands are the spots visitors always miss, and the backs of hands are the ones guides always have wrecked.

So the sun kit earns more pack space than anything else its size:

Sun-protection item	Why it earns its place	The spot it saves
Broad-spectrum SPF 30 or higher	UV around Cusco hits 11, the extreme band, and climbs ~10 percent per 1,000 m	Face, ears, neck, backs of hands
SPF lip balm	Sun and glacier wind crack lips from both sides	Lips
Real UV sunglasses	Glacier light bounces up off water and pale rock	Eyes
Brimmed sun hat	Midday sun is strongest on the exposed middle of the climb	Scalp, face, neck

Water, snacks, and the soles in my pocket

I carry 1.5 litres minimum and drink on a schedule, roughly a cup every half hour of climbing, because altitude dehydrates you before you feel it. Cash comes along in small soles notes: the entrance fee runs 10 to 20 soles if you are not on a tour, horses cost around 80 soles, and tips are cash-only country.

Hydration at altitude is not about thirst. Dry air and hard breathing strip water out of you invisibly, and dehydration stacks on top of soroche symptoms until you cannot tell them apart. The wilderness-medicine rule of thumb I follow and repeat to groups is steady small doses during the effort, around 8 ounces every half hour while climbing, then more when you are down; general altitude-health guidance from the CDC's high-elevation pages backs the broader point that hydration and a slow pace are your two cheapest defences up here. Snacks: nuts, chocolate, a banana from the Mollepata shop. Nothing heroic. And a few coca leaves, which are legal, traditional, and genuinely help some people with the altitude, as I cover in the acclimatization guide.

The cash question comes up on every single departure, so here is my pocket, itemized:

Cash item	Amount (soles)	Notes
Entrance fee	10 to 20, reports up to 30	Community checkpoint fee; it changes; paid separately in cash; excluded by the featured tour
Horse at Soraypampa	~80 one way	Paid on site, not operator-managed; horses stop 15 to 20 min short of the lake
Tips	Whatever feels right	Guide and driver; there is no card machine on a mountain
Small buys	10 to 20	Bathroom stops, snacks, coca leaves in Mollepata

Small notes matter more than the total. A 100-soles bill at a trailside bathroom is a negotiation, not a payment. I covered the whole horse question, including who should genuinely take one, in the horse decision at Soraypampa.

What stays in the van, and what the tour already covers

Half of good packing is subtraction. On the featured departure, meals, first aid, an emergency oxygen bottle and an optional wooden walking stick are provided; entry is extra, so your daypack only has to cover the two hours on the trail, not the whole day.

The van is your base camp on wheels, and I treat it that way. A change of dry socks and shirt lives there for after the descent, along with anything valuable I do not want bouncing up a mountain. The optional walking stick surprises people; the descent is where knees complain, and the stick earns its keep going down, not up.

The three-column version of my whole philosophy:

Goes in the daypack	Stays in the van	Already provided (per the listing)
Water, 1.5 L minimum	Dry socks and spare shirt	Breakfast and buffet lunch
Three layers, hats, gloves	Leave big luggage and valuables at the hotel	Bilingual guide
Sunscreen, lip balm, sunglasses	Laptop, anything heavy	First aid kit and emergency oxygen
Snacks, entry money in cash	Second camera lens you will not use	—
Small soles notes	Travel documents you do not need	Optional wooden walking stick
Phone, power bank, headlamp		Transport there and back

The two things first-timers always forget

Lip balm with SPF and warm gloves. Every week someone hits the shore with burned, cracked lips and hands too cold to work their phone. Both items weigh nothing, cost little in any Cusco pharmacy, and fix the two complaints I hear most at 4,200 metres.

The lips first. Altitude sun and glacier wind work on them from both sides, and regular sunscreen is unpleasant to put on your mouth, so people skip it. By the van ride home their lips are cracked, and the damage follows them around Cusco for days. A stick of SPF lip balm ends the problem completely. I keep two, because I keep giving mine away.

The gloves are the sneakier one. Visitors check the forecast, see daytime highs near 20 C, and conclude gloves are for winter. Then they stand in the glacier wind at the shore trying to take photos, and within ten minutes their hands are the coldest part of their whole body. Early starts make it worse; the trailhead can sit at or below freezing when you step out of the van. Thin fleece gloves are enough. You will wear them for ninety minutes and be grateful for every one of them. My full clothing rundown, including footwear, is in the packing guide.

That is the whole bag. Nothing in it costs serious money, and nothing in it is optional after you have watched enough cold hands and cracked lips at the shore. Pack it the night before, put the alarm across the room, and let the mountain handle the rest of the drama. It always does.