Decathlon MT900 70+10L Review: A Feature-Rich Pack That Faces Tough Alternatives

Introduction

A large trekking backpack is one of the few pieces of gear where the wrong choice follows you for every mile of a trip. The Decathlon MT900 70+10L sits at the top of Decathlon’s hiking range at $210, and it arrives with 80 liters of capacity and a feature list that rivals packs costing considerably more. It is also heavy, and its harness system shows its age.

This guide covers what the MT900 gets right, where it gives ground, and how it stacks up against two alternatives worth knowing about: the Osprey Atmos AG 65 and the lower-priced Decathlon Trek 100 70L.

What Matters in a Large Trekking Backpack

Four qualities decide whether a pack in this class works for you: how it carries weight, how much it weighs empty, how much organization it offers, and how well the harness adapts to your body.

Carry comfort is the hardest quality to fake. Padding thickness, belt structure, and frame design determine whether a 35-pound load still feels manageable after five hours on the trail or turns into a grind.

Organization is personal. Some hikers want a pocket for every category of gear, others prefer one large compartment and a few well-placed straps. Both approaches work, as long as you know which one suits you.

Fit adjustment matters just as much, especially for torsos at either end of the size range. A pack that cannot be dialed in will never feel right, no matter how good its materials are.

Decathlon MT900 70+10L: Features and Build

The MT900 70+10L is built around a free-floating lid that adjusts up and down and cinches onto the top of the load, secured by two buckles at the front and straps at the rear. The lid carries a large pocket with dual zipper pulls and an internal zippered compartment, and a rain cover is stored in a zippered compartment on the back of the lid.

The main body is a polyester pack with a 600-denier weave and a polyurethane coating, paired with YKK zippers. It measures 30.3 inches tall, 19 inches wide, and 15 inches deep, weighs six pounds, and comes in gray or black.

Loading and unloading happen two ways. A front panel opens via dual zippers and a velcro closure to expose the contents directly, and the top opening provides conventional access. Three compression straps sit behind that front panel, along with a hydration sleeve, a hydration hook, and a zippered mesh pocket on the panel’s inner face.

Side features are symmetrical. Each side has two compression straps, a large pleated zippered pocket that stretches as you fill it, a stretchy hydration sleeve above it, and an angled water bottle holder with a drawcord. The bottom of the pack carries two compression straps and gear loops for attaching trekking poles.

The harness is where the feature count peaks: load lifters, a grab handle, a fully adjustable torso length, two additional buckles above the harness for expansion, gear straps and loops, a fully adjustable sternum strap with an integrated emergency whistle, padded shoulder straps, and two aluminum stays forming the frame. The waist belt is adjustable and includes two small zippered pockets. In total, the pack offers 10 pockets.

Where the MT900 70+10L Falls Short

Price is the first sticking point. At $210 the MT900 sits close to top-tier backpack pricing, yet the body is primarily polyester, a material that is generally inexpensive to produce. For the same money you could buy an Osprey Atmos AG 65 on sale, and that pack is substantially more comfortable.

Weight is the second. Six pounds is very heavy for an 80-liter pack, where roughly four and a half pounds is more typical. The difference is noticeable the moment you pick it up.

Comfort is good rather than great. Below about 35 pounds the pack carries well. Above that, the shoulder padding and waist belt stop providing enough support, which is an odd limitation for a pack this large. The waist belt padding is soft to the point of compressing under load, while the shoulder padding is wide but thin and firm.

The torso adjustment system also feels dated. Changing the torso length is awkward, and several brands, Decathlon included, have moved to simpler systems. Two smaller points round out the list: there is no dedicated sleeping bag compartment, and the waist belt pockets are too small to reach once the belt is fastened.

Osprey Atmos AG 65: Comfort for Heavier Loads

The Atmos AG 65 is the obvious alternative at this price. It is a 65-liter pack rather than 80 liters, and it is substantially more comfortable to carry, with the structure to handle a heavy load without the same drop-off in support.

If comfort under weight is your priority and you are willing to trade some capacity and pocket count for it, the Atmos AG 65 is the more sensible purchase, particularly when it is discounted.

Decathlon Trek 100 70L: A Different Approach to Fit

The Trek 100 70L costs $130, well below the MT900, and it stands out as one of the strongest packs in Decathlon’s lineup. Its defining feature is a torso adjustment system unlike most others: you put the pack on, make your adjustments, and go, with no fiddling beforehand. Once you are on the trail, you can fine-tune the fit by pulling a strap.

The trade-off is organization. The Trek 100 offers only a handful of pockets, so hikers who like dedicated storage for every item may find it sparse.

For most buyers, that simplicity is easy to live with. The pack carries well, adjusts quickly, and leaves $80 in your pocket compared with the MT900.

Price and Value Across All Three Packs

The three packs land in three different places on value. The MT900 asks $210 for a polyester build and a dated harness. The Atmos AG 65 can be found on sale around the same figure and delivers better comfort under load. The Trek 100 70L costs $130 and offers an easier fit system, with fewer pockets as the compromise.

Overall Buying Advice

If pocket organization is what you value most, the MT900 70+10L has more of it than either alternative, and its build quality is genuinely excellent, with clean stitching and no loose threads.

For everyone else, the math is harder to justify. Lighter and more comfortable packs exist at the same price, and a lower-priced option from the same brand handles the essentials well. Decide whether you are buying pockets or buying comfort, then choose accordingly.

Conclusion

The MT900 70+10L is not a bad backpack. It is well made, loaded with features, and comfortable with loads under 35 pounds. But at $210 it is heavy, it uses polyester, and its harness adjustment feels behind the times. The Osprey Atmos AG 65 offers more comfort at a similar price, and the Decathlon Trek 100 70L delivers a simpler, easier-fitting pack for $130.