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== Use ==
If you are on the road for several days and sleep outside, you might –depending on climate and [[weather]]– need a shelter from wind and rain to stay warm and dry while sleeping in your [[sleeping bag]]. Bivouac sacks can increase the insulation effect by up to 15°C 15 °C by forming a barrier against wind and water. They also protect your sleeping bag against dirt and sparks e.g. from a camp fire.
Unlike a tent, they are very much lighter (about 500g) and smaller and can be carried along for cases where you unexpectedly need to sleep outside.
