40L Trekking Backpacks for Hiking and Multi-Day Adventures

The excitement builds as a multi-day trip approaches. But be warned: choosing your gear can quickly turn into a real headache. A poorly fitted, overly heavy, or simply uncomfortable backpack has the power to turn a dream adventure into a total nightmare. For 2-to-3-day hikes, a 40-litre capacity often strikes the ideal balance between carrying capacity and agility.

This guide is designed to give you clear benchmarks for choosing the 40L trekking backpack that truly meets your needs, all without unnecessary marketing jargon. We'll break down the essential criteria before presenting a selection of models that have caught our eye.

How to Choose Your 40L Trekking Backpack?

Before diving into specific models, it's crucial to understand the features that make all the difference on the trail. Here are three points to consider to make an informed choice.

1. The Carrying System: The Key to Comfort

A good trekking pack is much more than a simple container. It's an ingenious system designed to transfer the load from your shoulders to your hips—the area of your body best equipped to support weight over long distances.

• Backpack with a frame: An internal frame, often made of a lightweight aluminium alloy, forms the pack's skeleton. It provides the necessary rigidity for an effective load transfer to the hip belt. This is a critical factor for comfort as soon as the weight exceeds 8 to 10 kg.
• Ergonomic backpack: The back panel, shoulder straps, and hip belt must conform to your body shape. Look for S-shaped shoulder straps, a padded and ventilated back panel to reduce sweat, and a wide, comfortable hip belt. A perfect fit is essential to avoid pressure points and chafing.

2. Organisation and Access: The Details That Change Everything

During a multi-day hike, organising your gear is paramount. A well-designed pack will save you precious time and energy.

• Multiple compartments: A main compartment for bulky items (clothing, sleeping bag), a top pocket for small accessories (headlamp, first-aid kit), and expandable side pockets for water bottles are a fundamental starting point.
• Quick access: A zippered front access to the main compartment is a real plus, so you don't have to empty the entire pack to grab a rain jacket. Pockets on the hip belt are also very practical for keeping a snack or your smartphone within easy reach.
• External attachment points: Straps and loops allow you to secure gear like walking poles, a sleeping pad, or a tent to the outside, optimising the internal volume of your 40L camping backpack.

3. Durability and Protection: Ready to Face the Elements

Your pack will be exposed to branches, rocks, and the whims of the weather. Its durability is therefore a non-negotiable criterion.

• Resistant fabrics: Materials like high-density polyester or nylon (measured in deniers) offer excellent resistance to abrasion and tears.
• Waterproof hiking backpack: Few packs are fully waterproof. Most are "water-resistant," meaning they can handle light rain. For complete protection, the presence of an integrated rain cover is a significant advantage. Also, remember to check the quality of the zippers.

Our Selection of Backpacks for Your Next Adventure

Here are a few models that stand out for their technical features and design, suited for different user profiles.

PELLIOT Unisex 40L Trekking Backpack – Rock Grey

Why it stands out: This model is an excellent example of a technical unisex trekking pack. It incorporates an alloy frame designed to distribute the load optimally, relieving pressure on the shoulders and back. According to the manufacturer, its dynamic harness technology allows the shoulder straps to follow your movements, thereby reducing fatigue.

Advantages:

• Optimised carrying comfort: The load transfer system to the hips and the ventilated 3D back panel are designed for long distances with a moderate load (up to about 11 kg).
• Smart storage: It features multiple pockets, including one on the lid, a front "kangaroo" pocket, hip belt pockets, and attachment points for poles and a sleeping pad.
• Durable design: Made from an abrasion-resistant fabric for better longevity on the trails.

Who is it for? For hikers and trekkers planning 2-to-3-day outings who are looking for a technical pack focused on carrying comfort and excellent weight distribution.

PELLIOT Unisex 20L Trail Backpack – Black and Yellow

Why it stands out: With its more modest capacity, this pack is a relevant alternative for those engaged in more dynamic activities. Its design is focused on stability, lightness, and quick access, with an ergonomic harness that hugs the body to minimise bouncing.

Advantages:

• Ultra-light and stable: Designed not to hinder movement during intense activities like trail running or mountain biking.
• Robust fabric: The gridded polyester offers good resistance to tears and abrasion.
• Dedicated storage: Compartments designed for immediate access to gear (flasks, energy bars, phone).

Who is it for? Ideal for athletes seeking a compact and high-performance pack for day trips, trail races, or fast hikes where lightness and stability are the priorities.

ochama×J.ZAO 25L Hiking Backpack – Cloud Green

Why it stands out: This model is all about versatility. At 25 litres, it's suitable for day hikes, but also as a travel bag or for everyday use. Its main asset is its ventilated back, which enhances comfort during prolonged wear.

Advantages:

• Versatility: A clean design and capacity that work just as well on the trails as they do in the city or for carry-on travel.
• Comfortable and ventilated back: The back panel is padded and designed to promote air circulation.
• Lightweight: Its simple construction makes it a light and easy-to-handle pack.

Who is it for? Perfect for casual hikers, younger users, or anyone looking for a do-it-all pack that can accompany them from a Sunday hike to the daily commute.

Haven't found what you're looking for?

Do the models in our selection not check all your boxes? Every hiker is unique, with specific needs regarding volume, features, or style. To explore a wider range of options, feel free to browse our complete collection.

? Discover all our backpacks

Frequently Asked Questions about 40L Trekking Backpacks

1. What can you fit in a 40L backpack? A 40-litre volume is generally sufficient for a self-sufficient 2-to-3-day trip (excluding extreme winter conditions). You can fit a compact sleeping bag, a sleeping pad, a change of clothes, a waterproof layer, food for 2-3 days, a toiletry kit, a first-aid kit, and small camping gear (stove, cook pot).

2. Is a 40L pack big enough for a 3-day trek? Yes, for most 3-day treks in spring, summer, or autumn, 40 litres is a suitable capacity. However, this requires prioritising modern, compact gear. If you plan to carry a bulky tent, a lot of cooking equipment, or clothing for very cold conditions, a 50-litre volume might be more comfortable.

3. How do you properly adjust a trekking backpack? A precise fit is crucial. Start by loosening all the straps. Position the hip belt over your iliac crest (the hip bones) and tighten it. Next, tighten the shoulder straps so the pack sits snugly against your back. Adjust the load lifter straps (located above your shoulders) to pull the top of the pack towards you. Finally, adjust the sternum strap to stabilise the shoulder straps. The majority of the weight should rest on your hips, not your shoulders.