Decathlon Trek 100 Backpack Review: A 70-Liter Pack That Costs About $120

Introduction

A 70-liter backpacking pack that costs around $120 and includes a torso adjustment system you can tune while the pack is still on your back is an unusual combination. The Decathlon Trek 100 is exactly that pack, and it has stayed in regular rotation through three years of summer and winter trips. It is not the lightest option available, and it is not built for hikers counting every gram. What it does offer is a genuinely complete feature set, a comfortable carry, and build quality that has survived hundreds of outings. This review covers what the pack does well, who it suits, and the trade-offs worth understanding before buying.

Who This Backpack Is For

The Trek 100 makes the most sense for ordinary backpacking and camping trips rather than weight-obsessed thru-hikes. At 70 liters, it sits in a practical sweet spot. Load it fully for multi-day winter trips with bulky clothing and plenty of food, or compress it down for a lighter summer load and it still carries well. Because the torso system adjusts so easily, the same pack can be shared between two people of different sizes, which is unusual at this price.

It is not the right choice if your priority is shaving ounces for a long-distance thru-hike. A pack built for that purpose will be considerably lighter, and it will cost several times more. For everyone else, the Trek 100 covers the vast majority of real trips.

Capacity and Storage Layout

The main body is generous, and the sleeping bag compartment is one of the most impressive parts of the design. It is large enough to swallow a zero-degree down bag plus a blanket with room still left over, which makes cold-weather trips far easier to pack. A divider separates that compartment from the main cavity.

Access is flexible. A front zipper opens the pack wide so you can load, unload, and reach the contents without digging from the top, and the conventional top access is there as well. The lid is attached rather than free-floating, but it still provides a useful top pocket. Compression straps run across the pack and over the top, so you can attach extra gear and cinch a partial load down tight.

Around the outside you get side pockets, usable waist belt pockets, a hydration sleeve, and slanted water bottle pockets positioned so you can pull a bottle out, drink, and slot it back without stopping. A rain cover is included at this price, which is a meaningful inclusion rather than an afterthought.

The Easy Fit Torso Adjustment System

This is the feature that separates the Trek 100 from almost everything else near its price. Plenty of packs offer an adjustable torso length, but very few let you change that adjustment while you are wearing the pack. Loosen the harness, feel how sloppy the fit becomes, then pull the adjustment straps and watch the pack settle onto your back properly. Load lifters finish the job, and the whole process takes seconds.

In practice, that changes how the pack feels. You can dial in the fit at the trailhead, hand the pack to a family member, and reset it for them immediately. It also means you can fine-tune the carry as the load changes over the course of a day rather than living with a compromise.

Durability After Three Years of Use

Three years of regular use, across summer trips and winter trips, is a fair test for a budget pack. This one has been snowed on, iced over, and soaked through repeatedly. The stitching is still intact, the webbing and buckles show no failures, the harness is still comfortable, and nothing has torn or frayed. There are scratches and trail dirt, which is expected, but no structural problems.

The only cosmetic issue found on a careful inspection was a single loose thread on the product identifier on the lid. That is a minor detail rather than a durability concern. For a pack at this price point, that level of longevity is the strongest argument in its favour.

Materials, Frame, and Hardware

The body is built from 600 denier polyester. It is an inexpensive fabric rather than a premium one, and at around $300 you would reasonably expect something different. What matters here is how it is treated: the interior polyester has a polyurethane coating that helps it resist water, and the pack uses YKK zippers, which is uncommon at this price.

The frame is rigid and carries weight well, so a fully loaded pack does not feel like it is folding around you. The design itself is deliberately simple. There is a large internal cavity with only a few pockets, which keeps packing straightforward and means you always know where your gear is.

Things to Consider Before Buying

The pack weighs 4.2 pounds. That is reasonable for a 70-liter model, but it is not a lightweight figure, and it is the main reason a dedicated thru-hiker should look elsewhere. Comfort lands around 8 out of 10. The padding is perfectly adequate for long days on the trail, and more comfortable packs do exist, but they typically cost two or three times as much.

The simple pocket layout is a genuine advantage for some hikers and a limitation for others. If you prefer a place for every small item, this pack will feel sparse. If you pack in stuff sacks and stack your gear in one cavity, it will feel exactly right. The polyester construction is also a reminder that this is a value-focused pack rather than a premium one.

Buying Advice

At roughly $120, the Trek 100 is hard to argue with. It includes a rain cover, YKK zippers, a rigid frame, front and top access, a very large sleeping bag compartment, and a torso system that adjusts while worn. Decathlon backs its backpacks with a 10-year warranty, which is uncommon at this price and adds real confidence to the purchase.

Demand has been strong enough that this pack has sold out for extended periods in the past, so availability can fluctuate. If you want a pack for general backpacking and camping trips, this is an easy recommendation. If you are planning a thru-hike where every ounce counts, spend the money on a much lighter pack instead, because that is not the job this one was designed for.

Conclusion

The Decathlon Trek 100 delivers a full feature set, a comfortable and highly adjustable carry, and proven durability for around $120. Its on-the-body torso adjustment is the standout, and the large sleeping bag compartment makes it especially capable in cold weather. The trade-offs are weight and a simple pocket layout, both of which are reasonable at this price. For most backpacking and camping adventures, it is a straightforward, confident buy.