• THERMO-S1 staged outdoors
  • THERMO-S1 product view
  • THERMO-S1 detail
  • THERMO-S1 in use
1 4
★★★★★ Excellent 17,000+ Reviews

THERMO-S1 Emergency Sleeping Bag

THERMO-S1 Emergency Sleeping Bag

Sleep warm when the heating stops. The THERMO-S1 emergency sleeping bag reflects up to 90% of your body heat back to you — a windproof, waterproof thermal bag that packs down tiny and keeps a person warm through the coldest night.

  • Reflects up to 90% of your body heat back to you
  • NASA-developed thermal material
  • Full-length hooded bag — climb in and stay warm
  • Windproof & 100% waterproof
  • Packs tiny (~115 g); opens to 2.1 m
  • Reusable & tear-resistant — lifetime warranty
Low Stock Warning — Next restock: August 1st 2026
EVERY ORDER INCLUDES:
The Ultimate Survival ebook
The Ultimate Survival ebook
Essential crisis skills & self-reliance made simple.
$30FREE
Food Storage Guides & Workbook
Food Storage Guides & Workbook
Simple checklists to organize food, supplies & storage.
$20FREE
16 Emergency Prep Checklists
16 Emergency Prep Checklists
Covers everything needed for major emergencies.
$15FREE
Total value $65 — yours FREE with every order
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5,000L / 400-Gal
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Lifetime
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VISAMASTERCARDAMEX
★★★★★

"Keep one in the caravan and one in the car. Power went out for two nights and we zipped into these on the couch — warmer than any doona we own. The kids slept right through it."

Sophie L., Coffs Harbour NSW✔ Verified Buyer
Product Description
When the heating stops, warmth becomes survival. Blackouts, storms and evacuations don't wait for mild weather. Losing body heat overnight is one of the real dangers of any emergency — and it happens faster than most people expect. Your own heat, reflected back. The THERMO-S1 sleeping bag traps up to 90% of your body heat with a NASA-developed thermal lining, keeping you warm without fire or power. A full-length shelter you climb into. Windproof and waterproof, it blocks rain, wind and cold while you ride out a freezing night — at home in a blackout, in the car, or camping when the temperature drops. Packs to nothing. Weighs about 115 g, packs smaller than a drink can, and opens to 2.1 m. Unlike disposable foil blankets, it's built to be used again and again.
Shipping Details
Here is how our shipping process works. • Processing Time: 1–3 days • Cost: 100% FREE! Once shipped, you'll receive a tracking number so you know where your order is at all times. • Estimated Delivery: Most orders arrive 5–7 business days after being handed to the carrier. Need Help? If you have any questions about your order, contact us and we'll respond within 24 hours.
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Sleep Warm When the Power's Out

A full-length thermal sleeping bag that packs down tiny and keeps a person warm through the coldest night.

Sleep Warm When the Power's Out
1

90% Heat Reflection

NASA-developed lining bounces your body heat back to you.

2

Windproof & Waterproof

A sealed, hooded bag that blocks rain, wind and cold.

3

Extreme Range

Effective from −40°C to 50°C.

4

Tiny & Light

Packs smaller than a drink can (

5

Reusable & Tough

Durable and tear-resistant — not a single-use foil blanket.

How It Works

Traps Your Own Heat

The NASA-developed thermal lining reflects up to 90% of your body heat back to you instead of letting it escape. Your body makes the warmth — the bag keeps it in. No fire, no power needed.

Windproof & Waterproof

A sealed, hooded bag that blocks rain, wind and cold while it keeps you warm.

Climb In and Stay Warm

A full-length bag you get right inside — for a blackout at home, a night in the car, or a cold camp.

Packs to Nothing

Smaller than a drink can and about 115 g, opening to 2.1 m — and built to be reused, not thrown away.

the danger people underestimate

EXPOSURE: WHERE IT CATCHES PEOPLE OUT

A Blackout at Home
No heating when a storm takes the power. Why it matters: indoor temperatures drop fast overnight.
A Night in the Car
Stranded or evacuating with nowhere warm to sleep. Why it matters: running the engine burns fuel you may need.
A Cold Camp
The temperature drops further than your gear can handle. Why it matters: a bad night's cold ruins the trip — or worse.
An Evacuation
Leaving in a hurry with shelter hours away. Why it matters: warmth is the first thing you lose and the hardest to improvise.
Wet & Wind
The two things that pull heat from your body fastest. Why it matters: a windproof, waterproof bag is what stops it.

Read What Our Customers Have To Say

★★★★★

Warmer Than Our Doona

Power out for two nights — we zipped into these on the couch and the kids slept right through. Genuinely warm.

Sophie L., Coffs Harbour NSW✔ Verified Buyer
★★★★★

Lives in the Caravan

Packs down to nothing and weighs nothing. Perfect backup for cold nights away, and one stays in the car now too.

Andrew P., Ballarat VIC✔ Verified Buyer
★★★★★

Cheap Insurance

Expected disposable rubbish for the price. Reflective inside, blocked the wind, and it's held up to repeated use.

David R., Brisbane QLD✔ Verified Buyer

Lifetime Warranty: Your THERMO-S1 is guaranteed for life against manufacturing defects — if it ever fails to perform as promised, we'll replace it free, no questions asked. Backed by Ballast Supply: we build gear that works when your life depends on it.

FAQ

How does it keep me warm?
A NASA-developed thermal lining reflects up to 90% of your body heat back to you instead of letting it escape. Your body makes the warmth; the bag traps it — no fire or power needed.
What temperatures does it handle?
Effective from −40°C to 50°C, built for extreme conditions.
Is it waterproof?
Yes — 100% waterproof and windproof, protecting you from rain, wind and cold.
How small does it pack?
Smaller than a drink can (
Can I use it more than once?
Yes. Unlike disposable emergency blankets, it's made from durable, tear-resistant material for repeated use.
Can I use it at home or camping?
Absolutely — at home during a blackout, in the car, or as a backup on a cold camp.