Supposedly Down (and most other sleeping bag insulations) lose a lot of their thermal insulating properties when they are compressed.
When I'm inside a sleeping bag, obviously whichever side is on the ground is greatly compressed by my body weight.
Any ideas of how to reduce this?
I don't think it is a huge problem for most people. In a certain sense it is flawed by design; at least if you are concerned by weight saving.
Some bags will have variable filling with less down underneath for that exact reason.
If you always use a sleeping pad, some sleeping bags (e.g. Spoonbill UL) will simply have no bottom down fill based on that assumption.Tweet