PORTABLE AND COMPACT:Each weight 4.88 oz only.This survival sleeping bag is small enough to fit in the palm of your hand,easy to carry and store at anytime and anywhere.Our life bivvy sack are a must-have for outdoor,camping, trail running, marathons, bug out bag, car survival kit, earthquake survival kits,survival gear,hiking bag and travel first aid kit.MADE FOR EMERGENCY:Made of durable insulating Mylar material,perfect for emergency situations where warmth or protection from all-weather conditions is required.These thermal emergency blankets are designed to reflect up to 90% of body heat back so it can helps you to prevent the hypothermia even save your life in emergencies.The bright orange color and survival whistle also can signal for help rescuers find you. SNOW RAIN AND WIND PROTECTION:Constructed of 26um extra-thick mylar material with a tear resistant coating makes our survival blanket do better in waterproof, windproof, and moistureproof performance and helps to keep you dry and warm in damp, wet, rainy, and downright cold environments. MULTIPURPOSE EMERGEMCY USESUses are nearly limitless: use as tent footprint, rain poncho, emergency signal, emergency shelter, ground cover, bivouac sack, wind blocker, water collector, snow melt container and so on. Tear-ResistantThis emergency bivvy bag will surprise you with its strength. It's tear-resistant, windproof AND waterproof. Plus, this emergency sleeping bag features reinforced taped seam.Keep WarmKeep warm and Alive.Used as a survival emergency Bivy Sack, poncho, emergency shelter, Protect you from rain,wind and snow. It can be used as ground cover, sleeping bag liner when you in extreme environments.Enjoy!