Is weight really the most important thing when it comes to sleeping bags?

When I ask customers what kind of sleeping bag they need, I always get the same answer: "A small and light one."

Why is that? Because the industry has conditioned us to do so.

But is the lowest weight and smallest pack size really the most important thing?

Making a sleeping bag light and compact is actually quite simple. You use the thinnest (and most delicate) fabrics, make the bag tight, eliminate baffles that stabilize the insulation, and fill the lower section more densely than the upper section. This achieves great results in the lab. But outdoors, where the sleeping bag is supposed to provide true protection and recharge the next morning, this often doesn't work.

A sleeping bag needs sufficient internal space. If the insulation is constantly compressed by bumps, it can no longer insulate properly. If the sleeping bag is too tight, the body can't find a comfortable sleeping position. If there are too few chambers for the insulation, it will shift, creating cold spots. If your back isn't properly inflated and you turn around, heat will escape from the sleeping bag.

That's why a sleeping bag should have a reasonable weight and pack size, but it also has to fit and keep you warm. Only a good night's sleep will help you be fit the next day. And what's 200 grams? A sip of water? So: sleep well, because 200 grams won't cause you any problems.