Mummy

It offers high thermal performance thanks to its narrow design, which reduces air gaps and heat loss. It is lighter than rectangular ones, due to the use of less material. Recommended for hiking, mountaineering, or extreme temperatures.

It plays an important role, depending on the intended use of the sleeping bag. Ideally, for hiking, trekking, or mountaineering, a sleeping bag weighing less than 1.5 kg is recommended to facilitate transport and reduce the load on the backpack.

On the other hand, sleeping bags with greater weight are preferred for camping or stationary use.

Left

It not only concerns the ability to connect with another sleeping bag but also the ease of use. The zipper on the left side (as you lie down) is more convenient for right-handed people.

Down

It offers warmth, high breathability, and minimal weight. Sleeping bags with down take up little space as they are highly compressible. However, if they get wet, they lose their properties and are more expensive compared to synthetic ones.