International Trek Packs: Complete Guide
Comprehensive technical analysis of sizing, materials, installation requirements, and manufacturer standards for international trek packs.
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In plain English
Treks abroad come in two main styles. On some, like the Camino de Santiago in Spain, you carry everything yourself, but you sleep in hostels and buy meals in villages, so your pack stays small. On others, like Kilimanjaro in Tanzania, porters carry your big bag and you only carry a small pack for the day.
That is why two people on famous treks can have completely different backpacks. The question to ask is simple: what will be on my back while I walk? That decides the size, not how long the trip is.
Getting there matters too. You will probably fly, so the pack has to get through airport security and fit airline size rules. Some things hikers use at home, like camp stove fuel, cannot go on a plane at all and must be bought after you land.
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International treks set pack size by three things the trail decides for you: how many days you carry your own kit, whether porters or a duffel take the bulk, and the climate you cross. A self-supported Camino day pack and a portered Kilimanjaro summit pack are both "trekking backpacks," yet they sit at opposite ends of the size chart. This hub matches the world's popular treks to the pack and carry system each one actually rewards.
Most Camino walkers carry 20 to 30 liters, because you sleep in albergues and hostels rather than a tent, and villages resupply food and water daily. That removes the shelter, sleep system, and multi-day food that force a bigger pack elsewhere. A loaded Camino pack should stay near 10% of body weight, so a light 30-liter pack with a real hipbelt, worn correctly, is the standard. Walkers who send a bag ahead each day use an even smaller daypack. See how to size a pack to your torso before you choose a Camino pack.
Hut-to-hut routes like the Tour du Mont Blanc reward a 30 to 40 liter pack, because the mountain refuges provide beds, blankets, and meals, so you leave the tent, sleeping bag, and stove at home. What you do carry is layered mountain clothing, rain protection, water, snacks, and a light sleeping-bag liner, which some huts require (check each hut's rules). A ventilated 35-liter pack with a stable hipbelt and good rain cover suits most TMB and alpine hut circuits. The hut-to-hut activity guide covers what to leave behind on serviced routes.
Kilimanjaro and the Everest Base Camp trek are portered treks, so you carry only a daypack while a porter or yak moves your main kit in a duffel. On Kilimanjaro, operators set limits on the porter duffel's weight, so confirm your operator's limit before you pack, and you carry a daypack (25 to 35 liters is a typical size) with water, layers, sun protection, snacks, and camera. Everest Base Camp works the same way: a 30 to 40 liter daypack for the day, a soft duffel for the porter. Rigid-frame packs are the wrong tool for the duffel; a soft, lockable duffel is what these treks want.
Getting to a trek matters as much as the trek itself, so many international hikers choose a travel-friendly pack that meets carry-on limits and hides its straps for flights. A panel-loading 35 to 45 liter pack with a stowable harness travels as a carry-on and still carries like a hiking pack on trail. The travel-hiking activity guide covers convertible packs and carry-on compliance in depth.
Trek pack sizes at a glance
| Trek | Carry style | Typical pack |
|---|---|---|
| Camino de Santiago | Self-carried, hostels | 20–30 L |
| Tour du Mont Blanc | Self-carried, huts | 30–40 L |
| Machu Picchu (Inca Trail) | Portered | 25–35 L daypack |
| Kilimanjaro | Portered (duffel) | 25–35 L daypack |
| Everest Base Camp | Portered (duffel) | 30–40 L daypack |
Across every route the rule is the same: size the pack to what you carry on your back, not to the whole trip, and confirm your operator's porter or duffel rules before you buy.
Go Deeper
Detailed companion guides for international trek packs.
Best Backpacks For The Camino De Santiago
Buyer's guide: best backpack for camino de santiago.
Best Backpacks For The Tour Du Mont Blanc
Buyer's guide: best backpack for tour du mont blanc.
Best Backpacks For Machu Picchu
Buyer's guide: best backpack for machu picchu.
Best Backpacks for Everest Base Camp
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.
Best Backpacks for Kilimanjaro
Kilimanjaro is a portered climb: you carry a 25–35L daypack while porters move your kit in a weight-capped duffel. How to choose both.
Best Backpacks for the Wonderland Trail
The Wonderland Trail circles Mount Rainier for ~93 miles and is self-supported, so it needs a full multi-day pack sized to your food carry.
Trip-Length Capacity Guides
Related trails & trip guides guide.
Packing Lists
Related trails & trip guides guide.
The 10% figure for Camino packs
This page says a loaded Camino pack should stay near 10% of body weight. That is a widely repeated walking guideline rather than a Camino-specific standard, and no source in our library sets it for adults. The research that exists points to a range. A 2026 study of long-distance hikers notes the literature has suggested packs should not exceed 10 to 15% of body weight, and found packs heavier than about 10% produced a clear, load-dependent increase in foot pressure.1 In that study, forefoot pressure rose 5.41% with a 10%-body-weight pack and 8.73% with a 20% pack.1
Other sources set higher ceilings. Deuter, a manufacturer, says people can carry a maximum of 20 to 25% of their body weight, and a 2022 review says adult loads should generally not exceed 40% of body mass.2,3 For a walk of several weeks on pavement and gravel, where foot problems end many trips, the lower end is a sensible target. A systematic review found blisters and ankle sprains are the most common hiking injuries.4
Altitude on portered treks
Kilimanjaro and Everest Base Camp are portered, but the daypack still has to carry layers and water for high, cold, sunny days. The CDC Yellow Book 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.5 Above about 9,850 feet, it advises raising sleeping altitude no more than about 1,600 feet per day, and says never go higher to sleep while having symptoms.5 Anyone with worsening symptoms should descend and get medical help.
Sun is stronger up high. The EPA says UV intensity increases about 6% per kilometer of elevation, so sun protection earns its space in the daypack.6
Flying with trekking gear
Travel rules shape what goes in the pack before the trek starts. TSA prohibits flammable liquid fuels, including cooking fuel, in both carry-on and checked bags, and allows camp stoves only if completely emptied of fuel and cleaned.7,8 MSR notes that canister fuel is not available everywhere and that liquid fuel is safer for remote international travel, which matters on self-supported routes.9 Sharp-tipped hiking poles cannot go in carry-on bags.10
Carry-on size rules vary by airline. For example, Delta's carry-on maximum is 22 by 14 by 9 inches, and a small backpack can count as the free personal item if it fits under the seat.11 Check your own airline, and any connecting carriers, before choosing a travel-friendly pack. Porter duffel limits are set by trek operators and vary, so confirm yours in writing.