S.O.L. Emergency Bivvy review: the best survival value in your pack
Most people who die in the backcountry die of exposure, not injury. A 3.5-ounce emergency bivvy that reflects most of your body heat is the cheapest insurance you can carry against a cold, unplanned night out.
Planning for the worst? Pair this with our guides to emergency shelter and staying warm on a cold night.
Quick take
The single best-value survival item you can put in a pack. The S.O.L. Emergency Bivvy is a full-body sleeve of heat-reflective material that packs to the size of a soda can, weighs about 3.5 ounces, and traps most of your body heat if you’re stranded, soaked, or hypothermic. It’s not a comfortable bed and it won’t last many nights, but as no-questions emergency shelter, nothing this small does more to keep you alive.
What it does
The Emergency Bivvy is a sealed, sleeping-bag-shaped sleeve made from S.O.L.’s metallised material that reflects up to 90% of your radiated body heat back at you, far more effective than a flat emergency blanket, because it wraps your whole body and head. You climb in fully clothed; it blocks wind and rain and turns your own warmth into a survivable microclimate. It packs into a stuff sack about the size of a 4-ounce bottle, weighs roughly 3.5 ounces, and costs less than a restaurant meal, which is why it belongs in every pack, car, and canoe. It buys you a night, the margin between a miserable story and a tragedy.
What verified buyers say
Across verified-purchase reviews, the same points come up:
- Packs tiny, weighs nothing. Buyers repeat that it’s about the size of a soda can and barely heavier than a flat emergency blanket.
- Genuinely warm. Owners report staying warm through cold nights and even snowstorms, calling it far better than a mylar blanket.
- A life-saving kit essential. Many say it’s something no car, camping, or backpacking emergency kit should be without.
- Roomy enough. Buyers up to 6’4″ report fitting inside with clothes on.
Worth knowing
It’s emergency shelter, not a sleeping bag. There’s no insulation underneath you, so you’ll still lose heat to the ground. Pair it with a foam pad if you can, and the non-breathable material means condensation builds up inside overnight. The lightweight version is best treated as one-to-a-few uses; repack it carefully. None of that is a knock: it’s doing exactly its job, which is keeping you alive for an unplanned night, not making it pleasant.
Who it is for
For everyone who goes past the trailhead, day hikers, backpackers, hunters, paddlers, and anyone with a car emergency kit. A first-timer needs no skill to use it, and seasoned trippers carry one as automatic exposure insurance. Combine it with our advice on emergency shelter, staying warm on a cold night, and spotting hypothermia.
Specs at a glance
Weight: ~3.5 oz · Reflects up to 90% of body heat · Packs to ~soda-can size · Full-body sleeve with hood · Best for: emergency exposure protection in any kit
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The Verdict
The S.O.L. Emergency Bivvy is the most life per ounce you can buy: a sleeve the size of a soda can that can carry you through a cold night out. Put one in every pack and vehicle and forget about it until the day it matters. Learn how to use it in our guides to emergency shelter and surviving a cold night, and how to recognise hypothermia.
