Emergency sleeping bags are essential for outdoor survival, but they can have side effects that users should be aware of. These lightweight, compact bags are designed to retain body heat, but improper use may lead to overheating or discomfort, especially in warmer climates.

Some users report skin irritation due to the materials used in emergency sleeping bags. These bags are often made of plastic or mylar, which can cause allergic reactions or rashes in sensitive individuals. It's crucial to test the material before reliance on the bag in emergencies.

Additionally, while emergency sleeping bags provide warmth, they can also limit ventilation. This can lead to increased humidity inside the bag, presenting a risk of hypothermia if moisture accumulates. Understanding these side effects can help users make informed decisions during outdoor excursions.