Leberna Emergency Bivy Sack 4 Pack | Mylar Survival Sleeping Bags

Compact, heat-preserving emergency shelter you can trust

Leberna’s Emergency Bivy Sack 4-pack brings NASA-inspired Mylar foil technology into a lightweight, portable solution for unexpected cold, rain, or wind. Each bag is designed to reflect heat back toward you, creating a practical thermal layer without added bulk. In tense moments where warmth matters, this set offers a reliable, ready-to-use option that can be deployed in minutes.

Designed with space-conscious users in mind, these bivy sacks are remarkably light and highly packable. Each bag weighs roughly 2.8 oz and fits into a compact carry pouch measuring about 7 by 3 inches. That means you can stash multiple layers in a vehicle emergency kit, backpack, or travel bag without sacrificing space for other essentials.

What makes these bivy sacks stand out

• Mylar foil reflects up to 90% of body heat, creating a reflective thermal layer without bulk.
• Extra-large dimensions measure 84 inches long by 36 inches wide, ensuring full-body coverage for most adults.
• Four-pack convenience provides ample coverage for a group, or multiple uses—from blanket to rain protection.
• Each bag weighs about 2.8 oz and nests in a small carry bag (7 by 3 inches) for easy storage.
• Waterproof, windproof, tear-resistant, and puncture-proof construction holds up to outdoor conditions.
• A built-in 120-decibel whistle aids signaling in an emergency.
• The upgraded head cover is 21 inches wide, helping seal warmth around the head and neck.
• Versatile as an emergency blanket, ground cover, rain poncho, sun shade, or shelter during outdoor adventures.

Practical, real-world uses

Keep a set in your vehicle for roadside emergencies or cold-weather nights. In a camping or hiking scenario, these sacks can serve as a quick shelter layer or a protective blanket while you wait for help. The foil surface stays lightweight yet durable, ready to deploy when needed most.

Because the bags are designed to be compact and easy to store, you can use them as temporary protection from rain, wind, or snow, or as a reflective surface for signaling. The combination of warmth retention, weather resistance, and portability makes them a versatile addition to any emergency kit.

How to maximize value

• Store all four sacks in their carry pouches inside your car, backpack, or home emergency kit for rapid access.
• Lay the bivy flat for a quick seat or rest mat, or use as a ground cover during breaks in outdoor activities.