Sierra Madre Emergency Sleeping Bag – Ultralight, Waterproof Mylar Thermal Bivy Sack Tent for Hiking, Bug-Out Bags, Survival Kits
Best for
Best ultralight
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$11.09
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Verified-purchase reviewers rate this Sierra Madre ultralight mylar bivy at 4.7 across roughly 632 ratings, praising it as a featherweight, packable sleeping-bag-shaped shelter for hiking and bug-out bags. Buyers like that it combines the warmth of an enclosed bivy with mylar-level weight and packability, hitting a middle ground between flat blankets and heavier reflective bivies. At its lower price point it reads as strong value among the candidates.
What reviewers liked
- Very lightweight and packable enclosed bivy per reviewers
- 4.7 average across ~632 verified-purchase ratings
- Low price relative to fabric bivies
Where it falls short
- An identical-looking listing appears at a much higher price, so verify before buying
- Mylar construction is tear-prone according to category feedback
- No independent lab or expert verification in the data
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Verified-purchase reviewers rate this Sierra Madre ultralight mylar bivy at 4.7 across roughly 632 ratings, praising it as a featherweight, packable sleeping-bag-shaped shelter for hiking and bug-out bags. Buyers like that it combines the warmth of an enclosed bivy with mylar-level weight and packability, hitting a middle ground between flat blankets and heavier reflective bivies. At its lower price point it reads as strong value among the candidates.
One wrinkle the data surfaces honestly: an apparently identical Sierra Madre listing appears elsewhere in this pool at a substantially higher price, so shoppers should compare carefully before buying. The standard mylar caveats apply per reviewers, namely tear-prone material and condensation inside the sack. With no independent testing in our sources, the verdict rests on a respectable mid-volume customer consensus rather than verified performance.
- Stay Warm In Any Emergency
- Designed for survival in extreme conditions, Sierra Madre’s thermal bivy sack reflects 90% of body heat, keeping you warmer for longer in cold weather. Ideal for survival kits, bug-out bags, camping, and hiking.
- Waterproof & Windproof Protection
- Mylar was originally designed as a tear-resistant, insulating material by NASA for space exploration. Our durable PET emergency sleeping bag shields you from rain, wind, and snow, ensuring you stay dry and warm no matter the conditions.
- Ultralight With Full Coverage
- Weighing just 6 ounces, this survival bivy sack packs down small, fitting effortlessly into any backpack, glove compartment, or emergency kit for easy portability. Despite its light weight, our bag is larger for full coverage, fitting more body types comfortably.
- Durable & Reusable
- Unlike flimsy emergency space blankets, our survival bag is tough enough for multiple uses. Just fold it up and store it back in the drawstring stuff sack for your next adventure.
- Versatile Use - A Survival Essential
- According to the Red Cross, the elements are the #1 killer in any crisis situation. Whether you're a backpacker, hiker, prepper, or a parent, the Sierra Madre Emergency Sleeping Bag is a must-have—because safety should never be an afterthought.
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