How to Choose a Hiking Backpack: A Step-by-Step Guide

Choosing a hiking backpack comes down to four decisions: how much volume you need, how the pack fits your torso, which frame type suits your load, and which features will actually get used on trail. Getting those four things right gives you a stronger starting point than choosing based on brand or price alone.

Knowing how to choose a hiking backpack before you walk into a store or start browsing collections makes the process significantly less overwhelming. The options are wide, the terminology can get dense quickly, and the wrong choice in any of those four areas can show up as discomfort during longer hikes. This guide walks through each step in sequence so you can narrow the field with confidence and find a pack that fits how you actually hike.

Hiking Pack vs. Backpacking Pack: Which Do You Need?

Before working through the step-by-step process, it helps to confirm which category of pack you actually need, since the two types are built around fundamentally different use cases.

What Makes a Day Hiking Pack Different

A day hiking pack typically runs in the 10–35L range, designed to carry water, food, a layer or two, and basic safety gear for a few hours to a full day on trail. The suspension systems are lighter, the hip belts are often minimal or removable, and the overall build prioritizes breathability and low weight over load-carrying capacity. For many full-day hikes, a hiking daypack in the 20–30L range provides enough room for water, food, layers, navigation, and basic emergency gear without unnecessary bulk.

When You Need a Backpacking Pack

Once you are carrying a shelter, sleep system, food for multiple days, and a full change of clothes, the volume and support requirements shift considerably. Backpacking packs generally start at 40L and extend to 75L or beyond, built around a more substantial frame and suspension system designed to transfer heavier loads onto the hips rather than the shoulders. As pack weight increases, a structured suspension and properly fitted hip belt become increasingly important for transferring load away from the shoulders.

Step 1: Match Capacity to Trip Length

How to choose a hiking backpack starts with capacity, because it sets the ceiling on everything else you carry. Choosing too small a pack creates a packing puzzle on every trip; choosing too large means carrying extra frame and fabric weight you do not need. 

Quick summary: most hikers find a 20–35L pack covers day use, while anything requiring a sleep system and multiple days of food generally calls for 45L or more with a structured internal frame. These ranges are starting points rather than fixed rules; your gear volume, season, and packing style can move you into a different capacity range.

A useful approach is to estimate the volume of your packed gear before choosing a pack size rather than after. Packing light consistently opens up lighter, smaller options; packing for comfort and contingency pushes toward the upper end of each range.

Step 2: Measure Your Torso and Find the Right Fit

Volume gets you into the right size category, but torso measurement gets you into the right pack. A 65L pack that fits well carries more comfortably than a 60L pack that does not, and most discomfort on longer hikes traces back to fit rather than load.

How to Measure Torso Length

Torso length for backpacks is not your height and not the length of your back from neck to tailbone. It is the distance between two specific points: your C7 vertebra, the bony prominence at the base of your neck where it meets your shoulders, and your iliac crest, the top of your hip bones on each side. Have someone measure this distance with a flexible tape while you stand straight and tilt your head slightly forward to make the C7 more prominent. Many Osprey hiking packs and Gregory hiking packs offer multiple torso sizes or adjustable harness systems, and checking your measurement against a brand's size chart before buying can help avoid a common fit mistake.

Women's Fit vs. Men's Fit

Women's-specific backpacks are designed around different body proportions, typically featuring a shorter torso length, narrower shoulder straps, and a hip belt shaped to sit more comfortably around the hips. For some hikers, these differences can provide a more secure and comfortable fit by aligning the pack's harness and support points more closely with their body shape. Rather than simply choosing a smaller size of a unisex pack, trying both women's-specific and unisex models can help you determine which design provides the best fit for your body.

How to Test Fit Before You Buy

The most reliable way to test pack fit is to load the pack to roughly the weight you plan to carry, then put it on and adjust in a specific order: loosen everything first, then tighten the hip belt so it sits centered over the iliac crest with the padding wrapping the hip bones on both sides. From there, tighten the shoulder straps so they follow the curve of your shoulders without gaps, then snug the load-lifter straps so they pull the top of the pack toward your shoulders without creating excessive pressure. The sternum strap should clip across the chest without pulling the shoulder straps inward. If the hip belt padding ends before reaching your hip bones, or if the shoulder straps lift away from your shoulders at any point, the fit is off regardless of how the pack feels unloaded.

Step 3: Choose the Right Frame and Suspension

Frame type determines how well the pack transfers weight from your shoulders to your hips, which matters progressively more as your load increases. For light day hikes, frame choice has minimal impact; for multi-day trips with a full kit, it has significant impact on how you feel by the end of each day.

Internal Frame

Internal frame packs are the standard choice for most hiking and backpacking use. The frame, typically aluminum stays or a framesheet, sits inside the pack body and transfers load to a structured hip belt. The result is a pack that moves with your body on uneven terrain rather than shifting independently.

External Frame

External frames are less common in modern hiking and backpacking packs, but they can still be useful for heavy or awkward loads on relatively moderate terrain. They tend to allow more airflow between the pack and your back, though they are generally less stable on technical or uneven trails.

Frameless

Frameless packs are best suited to experienced ultralight hikers carrying relatively light, compact loads. Without a frame, the pack relies on the gear inside, particularly a sleeping pad in a back sleeve, to provide structure. Comfort tends to decrease as weight increases, so this option suits hikers with refined, lightweight gear lists.

How Load Should Transfer to Your Hips

Regardless of frame type, the hip belt carries the functional weight in a properly fitted pack. The hip belt should carry most of the pack's weight, while the shoulder straps stabilize the load and keep it close to the body. If the shoulders are taking the majority of the load after the pack is properly adjusted, the torso length is likely too long, the hip belt is positioned incorrectly, or the pack's frame does not match your body geometry.

Step 4: Evaluate the Features That Actually Matter

Once you know how to choose a hiking backpack based on capacity, fit, and frame, features become the deciding factor between packs in the same category. Not every feature earns its weight, and knowing which ones do for your hiking style simplifies the comparison.

Hip Belt, Shoulder Straps, and Sternum Strap

Padded hip belt wings that wrap fully around the hip bones matter significantly on loads where weight transfer is a priority. Thin or narrow hip belts on larger packs are often a sign that the design is not optimized for heavier carrying. Shoulder straps should be contoured to follow the curve of the shoulder without hard edges or pressure points. The sternum strap holds the shoulder straps in position across the chest and reduces lateral movement during active hiking; it should clip at mid-chest height with a small amount of horizontal adjustment.

Back Panel Ventilation

Back panels fall into two main categories: contact panels that rest against the back directly and ventilated or suspended mesh panels that create an air gap and can improve airflow between the pack and your back. Contact panels generally allow more stable load transfer and work better on heavier loads; ventilated or suspended mesh panels may feel more comfortable in warm conditions at moderate weights. Many hikers choose based on the climate they hike in most frequently rather than any single technical advantage.

Pockets, Access Points, and Organization

A practical organization system for trail use covers four areas: a main compartment for camp gear, a top or rear pocket for items needed during the day, hip belt pockets for immediate access to snacks and small items, and side pockets large enough for a water bottle reachable without removing the pack. Additional compartments can add weight and complexity, so consider whether you will actually use them before prioritizing them as a feature.

Hydration Compatibility and Rain Cover

A hydration reservoir sleeve and hose port are common on many modern hiking packs, but worth confirming before you buy. Some packs include an integrated rain cover stored in a base pocket; others require a separate cover. For sustained rain, a waterproof liner or dry bags inside the main compartment can provide more dependable protection for critical gear than relying on a rain cover alone.

Pack Weight: What to Expect by Category

Pack weight adds to total load, and knowing typical empty weight by category helps set realistic expectations before comparing specific models. Lighter packs generally use lighter frame materials and thinner fabrics, which may reduce durability under heavier or rougher use.

Quick summary: for weekend trips, a 50–65L internal-frame pack is a common starting point, while lighter gear lists may allow for a smaller or lighter pack.

FAQ

What is the difference between a hiking pack and a backpacking pack?

A hiking pack is generally smaller, in the 10–35L range, designed for day use without overnight gear. A backpacking pack starts around 40L and is built with a frame and hip belt system to carry shelter, sleep gear, and multiple days of food comfortably.

How do I measure my torso for a backpack?

Measure from your C7 vertebra at the base of your neck to the top of your iliac crest at your hip bones. This distance, taken while standing straight, corresponds to the torso length sizing used by most pack manufacturers.

How much should a loaded hiking backpack weigh?

There is no single ideal pack weight because it depends on your fitness, trip length, terrain, gear, and pack fit. In general, carrying less is easier on long hikes, provided you still have the equipment needed for the conditions and route.

Do I need a women's-specific backpack?

Not necessarily, but many hikers find that packs designed with a shorter torso length, narrower shoulder harness, and a hip belt shaped for different body proportions fit more comfortably than a standard pack in a smaller size. Trying on both options is the most reliable way to compare.

How important is pack fit compared to pack weight?

Fit should be a major priority. A lighter pack that fits poorly can still create pressure points and discomfort over a long day, while a slightly heavier pack with an appropriate suspension may carry more comfortably. Getting fit right is generally a better investment than optimizing weight alone.

Choosing the Right Hiking Backpack

Knowing how to choose a hiking backpack means working through the same four decisions in the same order: capacity, torso fit, frame type, and features. The right pack for a half-day trail walk and the right pack for a five-day ridge route are different products, and recognizing that early saves time and money. Appalachian Outfitters carries packs across all of these categories so you can compare options and find what actually fits your hiking style.