As my summer sleeping bag was slowly dying, I decided to find a suitable replacement for it. This time I chose a sleeping bag with down filling instead of synthetic filling. My second expedition Cumulus Excuistic bag is not suitable for summer journeys, mainly due to its volume and weight, but still I wanted to stay comfortable in temperatures close to zero, or even slightly below, while not giving up small volume and weight - just such a magical barrier, one kilo. Adding to this that the price was supposed to be attractive, the market narrowed dramatically. As usual, when I buy a new item, I browse the Internet, compare products, check the pros and cons. In general, I spend a lot of time before I make my final choice. Of course, first I looked at the products of domestic companies, but the cost of the sleeping bag, which I required this time, approached and sometimes even exceeded the round sum of a 250E. I thought it was a bit too expensive, because the sleeping bag will have a hard life around most of the time, when I intend to use it. By chance, I came across Decathlon's offer knowing that they have down products in their offer, mainly the valued by me brand Simond. This time, however, the choice stop on the TREK 900 model costing 149E. I approached with caution, but field tests showed very good quality and thermals. 

The sleeping bag is very well made, the seams are carefully guided, the compression bag is well thought out and the material has passed all the accidental attempts at damage. 
My size L, weighs less than a kilo and has half a kilo of duck down filling. Thanks to the fact that there are three sizes of the sleeping bag available, you can fit it perfectly to our silhouette, remembering to leave some space in your legs to dry damp clothes. A big plus. You could wonder if the elasticity of duck down to feathers with a ratio of 85:15, will have as much as 800Cuin, but I will not be so strongly doctoral thesis. It is enough that the sleeping bag maintains a good level of compression and when taken out of the bag it expands very quickly and it seems that the parameters are similar to those given by the manufacturer. At least in organoleptic evaluation. 

It is a hit for me at this price brick construction (or H-shaped chamber if you prefer). What does it mean? The sleeping bag is sewn without places to go, which would mean thermal bridges and radical deterioration of the thermals. In theory, down in every possible place of the sleeping bag isolates us from the environment. It is like for this amount outclassing the competition. The sleeping bag is equipped with a skirting board preventing the material from being "caught" by the zipper, fulfilling its tasks but not fully. It should be a bit wider, especially when we are tired, at night it happens to jam the material and the minus. Another disadvantage is the lack of a thermal collar at the neck level. Fortunately, the manufacturer took care of a down slat along the zipper, which prevents the cold from getting inside. The zipper itself is quite short but in a technical sleeping bag it is not necessary to make it longer, as well as the impossibility of tying two copies together. There is also no pocket inside for small items, especially needed for electronic batteries, quickly exhausted in low temperatures.

The manufacturer gives a comfortable temperature of 0 degrees according to ISO 23537 - 2017. This is a very subjective value, because each has a different threshold of feeling cold. Judging by the several cold nights spent in a tent in this sleeping bag, I am willing to accept it. As we know, down sleeping bag should be protected from moisture. I'm not sure if the hydrophobicity of the material, which is praised by the manufacturer, will last a long time. At the beginning of using the product, water droplets actually had a natural penetration into the outer shell. Probably after several dozen times of folding and disassembling, the water repellency will die, but it is still good. 
The standard is that you get a storage bag for each down sleeping bag. It is no different in this case. The manufacturer gives an additional 5-year warranty for what an additional bow. 

To sum up, I recommend very, definitely worth the plus of the whole enormity and the defects found only a handful. The most important to balance:


  • H-chamber construction

  • good shape, envelops the body optimally

  • hydrophobicity of the coating

  • small but profiled and functional hood

  • good quality and completely thought-out design 


  • the zipper likes to cut itself

  • no thermal collar around the neck 


*I assure you that I have no connection to the Decathlon brand and that the opinion comes only from the observation in the use of the sleeping bag.

Decathlon Trek 900 sleeping bag - warmth for a reasonable price

10 July 2019