A backpack that looks good in a product photo might start digging into your shoulders after a few kilometers, shift the weight onto your lower back, or make it difficult to access your rain jacket. That is why the question of how to choose a trekking backpack should not start with its color or the number of pockets, but rather with your planned route, the amount of gear, and your own physique. A well-fitted model transfers the load mainly to your hips, sits stably on your back, and allows you to pack your gear without having to force it in.
Start with the type of trip, not the liter capacity
The same user might need a completely different backpack for a day hike in the Beskids, a weekend camping trip, and a week-long expedition with full bivouac gear. Capacity is important, but the number of liters alone doesn't tell you whether you will be able to fit the entire set. Much depends on the season, the type of accommodation, the volume of your sleeping bag, your cooking method, and whether you are carrying shared gear for several people.
For a one-day outing, a 15-30 l backpack is usually enough. It will hold water, food, a first-aid kit, an extra layer of clothing, a jacket, and basic navigation tools. If you are going out in winter or in variable weather, staying closer to the upper limit of this range makes it easier to pack insulation, gloves, and a thermos.
For an overnight trip, a capacity of 30-45 l is most often the right fit. This is a reasonable range for someone bringing a sleeping bag, a sleeping pad, a change of clothes, a camping stove, and a small supply of food. If you are staying in a mountain hut, you can go lower, but if you are bivouacking under a tarp or in a tent, it is worth leaving some extra space.
45-65 l backpacks are mainly designed for multi-day treks with full equipment. They accommodate a sleeping system, food supplies, a filter or another water purification system, cookware, and clothing layers for colder conditions. It is worth choosing a model above 65 l only if you are actually carrying a lot of gear: winter equipment, child-related equipment, shared camping items, or supplies for a longer stretch without the possibility of restocking.
A backpack that is too big encourages packing things "just in case." One that is too small forces you to attach gear to the outside, where it is easier to get wet, lose, or snag on branches. It is best to assemble your planned set at home and check how much space it takes up in practice.
How to choose a trekking backpack for your physique
Capacity affects how you organize your luggage, but comfort on the trail is primarily determined by the suspension system. When trekking, the weight should not hang on your shoulders. A well-adjusted hip belt takes the majority of the load and rests on your hip bones, while the shoulder straps stabilize the backpack against your back.
The most important parameter is your back length, measured from the base of the neck to the top of your hip bones. Many models come in sizes S, M, and L or have an adjustable suspension system length. Adjustment is practical when the backpack is used by different people, but it does not replace the proper size range. A person with a short torso using a backpack that is too long will not be able to set the hip belt in the correct place, even if they tighten all the straps.
When trying it on, put a load inside that is similar to what you plan to carry. An empty backpack might feel comfortable, but it won't show you how the straps and hip belt perform under weight. First, set the back length, then fasten the hip belt, tighten the shoulder straps, the load lifters at the shoulders, and the chest strap. Do not tighten it too much – its purpose is to keep the shoulder straps in place, not to restrict your breathing.
Pay attention to whether your shoulders are not excessively burdened and whether the top of the backpack is tilting backward. The hip belt should embrace your hips with a wide, well-padded section. If after a few minutes you feel localized pressure on your spine, collarbones, or hips, change the adjustment or the size. Discomfort in the store usually becomes more pronounced on the trail.
Suspension system: ventilation or stability?
Trekking backpacks most often have a classic suspension system, where the back of the backpack sits against your back, or a mesh ventilation panel that keeps the luggage away from your body. The mesh improves airflow during hikes in the heat, but it often shifts the center of gravity further from your back. For lighter, single-day sets, this is usually a good compromise.
For long routes and with heavier loads, a stable, adjustable suspension system with stiffening often works better. It keeps the weight closer to the body, which makes it easier to move along steep paths, scree, and uneven terrain. The design must correspond to the nature of the expedition, rather than just providing maximum ventilation.
Match the design to your packing method
Comfort in the field also depends on how you access your equipment. A top-loading backpack is simple, light, and often very capacious, but it requires a thoughtful arrangement of items. A model with a U-shaped zipper, a front panel, or bottom access allows you to reach your sleeping bag, jacket, or stove faster without taking out half of the contents.
Side pockets are useful for a water bottle, filter, map, or trekking poles. A large front pocket made of elastic material works well for a wet rain jacket or a tarp that you don't want to store next to a dry sleeping bag. Pockets on the hip belt allow you to keep your phone, an energy bar, a compass, or a small multitool close at hand.
If you use a hydration bladder, check if the backpack has a separate compartment for the hydration system and an opening for the tube. This is a convenient solution during a long hike, but it does not replace an easily accessible bottle, especially when water needs to be filtered or collected from a shallow source.
Attachment points are also useful. They allow you to securely attach poles, an ice axe, a sleeping mat, or a helmet, but they should not be used for carrying all your equipment. Items placed on the outside change the backpack's balance and are exposed to rain. A rain cover protects the material, but in the case of hours of heavy rain, it is worth additionally packing your sleeping bag, electronics, and clothing in waterproof bags.
Backpack weight and material matter
A light backpack limits the base weight of your gear, which you will appreciate on longer ascents. However, ultralight models can be less rigid, have a simpler hip belt, and be less resistant to intensive use. This is a good choice for someone who packs light, controls the weight of every element of the set, and moves along well-predictable routes.
If you are carrying a tent, a larger supply of water, or equipment for several days, a sturdier backpack with an effective frame will be more sensible. A few hundred grams more can mean significantly better load transfer and greater material durability. Look for reinforcements in areas prone to friction, solid zippers, strong buckles, and easily accessible replacement parts.
Do not judge water resistance solely by the type of fabric. Most trekking backpacks are resistant to light rain, but the seams and zippers are not always completely sealed. For a multi-day trip in wet conditions, the most reliable approach is a combination of a rain cover and internal organization in waterproof bags.
Pack your backpack to assist your hike
Even the best suspension system will not work well if heavy items are placed far from your back or low near the bottom. A sleeping bag, lightweight sleeping clothes, and spare layers can be placed in the lower section. The heaviest items, such as food, water, a stove, or metal cookware, should lie close to the back, roughly between the shoulder blades and the hip belt.
In the upper section, place items you need quickly: a first-aid kit, a headlamp, a rain jacket, snacks, and a map. Emergency gear must be secured, but it should not require unpacking the entire backpack. After packing, tighten the compression straps. They will limit the shifting of contents and improve stability during descents.
Before you leave, walk with your loaded backpack for even ten or fifteen minutes on stairs or a local route. This is a simple test that allows you to improve the fit of the shoulder straps, check access to water, and discard items you don't need. At BeOnWin, it is easy to compare backpacks by capacity and purpose, and then select the remaining pieces of camping equipment to go with them. On the trail, what matters most is not the biggest backpack, but one that remains stable, comfortable, and ready for the conditions that actually await you on the route.