How to use it properly: To prevent moisture to get trapped inside, keep your head above the bag. You don’t want your breathing to create wet air. Put a woolen hat instead to avoid losing temperature through your head.
Condensation is the greatest enemy of the emergency sleeping bag. The bag can’t breathe, which causes moisture from your sweat to accumulate. This way, an emergency bag won’t keep you dry and warm. It loses its main function and you can end up frozen to death.
For that reason, opt for clothes that are not made from cotton. Choose materials such as wool and synthetics. Wool is also a great insulator and it will keep you dry. Avoid tight-fitting clothes that may slow your circulation.
In case you get warm, use a vapor barrier between your body and sleeping bag to minimize condensation. It will prevent the wet from sweating to get trapped and fill out the bag.
The common mistakes: As already mentioned, an emergency sleeping bag is not intended for insulation. It won’t prevent your body from conduction, or from losing its heat through a clod ground, so you want to make sure that you have something to insulate your body. You may use dry leaves for that purpose.