The Everest Base Camp trek is portered, so you carry a 30–40L daypack while a porter moves your kit in a duffel. Here's how to choose both.
By Priya Anand, Backpacking Gear Research Writer · Published September 14, 2026, 6:03 PM ET · Updated September 29, 2026, 6:16 PM ET
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In plain English
Everest Base Camp is a famous walk in Nepal to the foot of the world's highest mountain. You don't climb Everest itself. You walk for about two weeks through mountain villages, sleeping in simple lodges called teahouses.
A porter, a local worker paid to carry loads, takes most of your things in a big soft bag called a duffel. You carry a smaller daypack with what you need during the day: water, snacks, warm layers, a rain jacket and sun protection.
The biggest challenge is the height. The air holds less oxygen the higher you go, and your body needs time to adjust. Going up slowly matters far more than being fit. A light, comfortable daypack makes each day easier, but it can't replace a slow, steady climb.
The best backpack for the Everest Base Camp trek is a 30 to 40 liter daypack, because EBC is a portered, teahouse trek: a porter carries your main kit in a soft duffel while you walk with only the day's essentials. You never carry a full expedition load, so a large internal-frame pack is the wrong choice.
What you carry each day
At altitude you want water (2–3 liters), warm layers you will add and shed constantly, a down jacket, rain shell, sun protection, snacks, and a camera within reach. A ventilated 35-liter pack with a supportive hipbelt, a hydration sleeve, and a rain cover handles this comfortably. Trekking-pole attachment matters, because most trekkers use poles on the descents.
The porter duffel
Your heavy kit — sleeping bag, most clothing, toiletries — travels in a soft, lockable duffel that operators weigh and cap, so check your operator's limit. Choose a rugged 70 to 90 liter duffel, not a framed pack, so it stacks on a porter or yak. Keep your passport, money, medication, and electronics in the daypack you carry, never in the duffel.
Altitude and fit
Because you gain serious elevation, a lighter daypack is a real advantage. Dial in torso fit before the trek so the hipbelt carries the load and your shoulders and lungs are free to work at altitude.
Frequently Asked Questions
A 30 to 40 liter daypack is standard for Everest Base Camp, because the trek is portered: you carry only the day's water, layers, and essentials while a porter moves your main kit in a duffel. A large expedition pack is unnecessary and too heavy at altitude.
The trek's pace is set by the body's need to adjust to altitude, not by how much you carry. CDC's travel guidance says any unacclimatized person sleeping at 8,000 feet or higher is at risk of altitude illness, and that physical fitness and training do not protect against it.1 Above about 9,850 feet, CDC advises raising sleeping altitude by no more than about 1,600 feet per day, with an extra acclimatization day for every 3,300 feet.1
Headache is the main symptom of acute mountain sickness, usually starting 2 to 12 hours after arrival at a new altitude. CDC's rule is never to go higher to sleep with symptoms, however mild, and it notes that descending 1,000 feet or more usually brings rapid improvement.1 A daypack that holds a warm layer, water and snacks means you can stop and rest when your body asks. Talk to a doctor before the trip about altitude and any health conditions.
Water on the trail: weight and treatment
The page suggests carrying 2 to 3 liters, which is the heaviest part of the day's load: a liter of water has a mass of about 1 kilogram.6 How much to drink is individual. CDC's Yellow Book says drinking to relieve thirst helps prevent hyponatremia, a dangerous drop in blood sodium, and calls 'you can't drink too much' outdated advice.7
Refills need treatment. CDC says to boil clear water for 1 minute, or 3 minutes above 6,500 feet, and adds that even at about 16,000 feet boiling water is still hot enough to kill intestinal germs.4,5 It also warns that portable microfilters do not reliably remove viruses such as norovirus, so check what any filter or treatment you pack is rated for.5
Sun and cold at high altitude
High, dry and snowy terrain concentrates sun exposure. EPA says UV intensity rises about 6% per kilometer of elevation, and that snow, water and sand reflect the sun's rays and raise the chance of sunburn.2,3 EPA also warns that UV can cause snow blindness, a temporary loss of vision from sunburned corneas, so sunglasses deserve a reachable pocket.3 CDC recommends broad-spectrum SPF 30 or higher, reapplied every 2 to 4 hours.8
Temperatures swing hard between sun and shade, which is why a down jacket rides in the daypack, not the duffel. CDC says hypothermia can develop above 40°F if you are chilled by sweat or rain, and early warning signs include shivering, confusion and fumbling hands.9 Keeping a dry layer on your back, rather than in a duffel that may arrive hours later, is the practical protection.
Flying in with trekking gear
Most trekkers fly, which shapes what goes in each bag. TSA does not allow sharp-tipped hiking poles in carry-on bags, though blunt-tipped poles are allowed.10 Flammable cooking fuel is prohibited in both carry-on and checked bags.11 These are US departure rules; check your airline and connecting countries too.
