SENTRY-2 Emergency Sleeping Bag
SENTRY-2 Emergency Sleeping Bag
The 2021 Texas freeze killed 246 people — most from hypothermia, many inside their own homes.
The SENTRY-2 needs no power, no fire, and no setup. Climb in, and the heat-reflective mylar lining bounces your own body heat back at you while the sealed shell blocks wind, rain, and ground chill.
- No power, fire, or batteries required
- Reflects up to 90% of your body heat
- Waterproof & windproof shell
- Tear-resistant ripstop — reusable, not one-and-done
- Built-in high-decibel rescue whistle
- ULTRA light — fits in the palm of your hand
BLACKOUT SALE 🇺🇸 | FREE WITH EVERY ORDER:
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Product Description
Product Description
Three Hours. That's the Margin.
You can last three days without water. In cold, wind, and wet, exposure can take you down in about three hours — and the countdown starts the moment you stop moving.
It doesn't take a mountain storm. A car dead on a winter highway, a grid failure in January, a hike that ran two hours past dark. The people who planned stay warm while they wait. The people who didn't become the emergency.
Wrap Up, Warm Up
The SENTRY-2 is a full-body bivvy sack, not a flimsy space blanket. Climb in and the mylar lining reflects up to 90% of your own body heat back at you, while the sealed shell blocks wind, rain, snow, and ground chill. No fire, no batteries, no setup — your body heat is the only fuel it needs.
Seen and Heard
The shell is bright safety orange, so a search party spots you against snow, brush, or roadside dark. The included high-decibel survival whistle carries far beyond shouting range — and keeps working long after your voice gives out.
Built to Wait
Packed in its drawstring stuff sack, the SENTRY-2 fits in the palm of your hand and has no expiration date. Tear-resistant ripstop material means it isn't one-and-done: dry it out, repack it, and it's ready again. Backed for life.
Put one in every glovebox, go-bag, and coat pocket. The time to have it is before the temperature drops.
Shipping Details
Shipping Details
Every order ships from the USA.
- Processing: 1–2 business days
- Shipping: Free within the U.S. A tracking link is emailed the moment your order leaves the warehouse.
- Delivery: Typically 3–6 business days after carrier handoff.
Peak-season note: during hurricane season and the holidays, carriers can run 1–3 days behind. We'll keep you posted if your order is affected.
Questions? Email support@sentryprovisons.com — a real person replies within one business day.
Everything in the box
This Is What's Included
Small enough to forget in a glovebox, complete enough to matter when you're stuck in one. Everything you need to trap heat, stay dry, and get found.
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Emergency Bivvy
The SENTRY-2 itself: a full-body, heat-reflective bivvy sack sized for a full-grown adult — boots, coat, and all.
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Survival Whistle
High-decibel rescue whistle on the drawcord. It carries far beyond shouting range and never runs out of breath.
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Drawstring Stuff Sack
Packs the bivvy down to palm size and keeps it dry until the day you need it. Repacking takes under a minute.
- 1× SENTRY-2 emergency bivvy
- 1× high-decibel survival whistle
- 1× drawstring stuff sack
WHAT THE SENTRY-2 STOPS
What's Actually Out There...
Wind & Wind Chill
Blocked by the sealed, windproof shell.
- Wind chill
- Drafts
- Storm gusts
- Convective heat loss
Why it matters: Moving air strips body heat far faster than still air — wind turns a cold night into a dangerous one.
Rain, Snow & Damp
Shed by the waterproof shell before it soaks your clothes.
- Rain
- Snow & sleet
- Ground moisture
- Morning dew
Why it matters: Wet clothing pulls heat from your body many times faster than air — staying dry is staying warm.
Ground Chill
A barrier layer between your body and the cold surface under it.
- Frozen ground
- Concrete
- Vehicle floors
- Snowpack
Why it matters: Lying on a cold surface drains heat by direct contact — even a good coat can't stop it.
Radiated Heat Loss
The mylar lining reflects up to 90% of your body heat back at you.
- Escaping body heat
- Cold-air exposure
- Overnight temperature drops
Why it matters: Your body radiates heat away constantly — reflecting it back is warmth that costs no fuel, no batteries, no fire.
Going Unnoticed
Countered by the bright safety-orange shell and the built-in whistle.
- Low light & nightfall
- Distance from searchers
- A voice that gives out
Why it matters: Most rescues come down to being seen or heard — orange does one, the whistle does the other.
FAQ
Isn't this just a space blanket?
No — and the difference matters at 2 a.m. in the wind. A space blanket drapes over you; every gust lifts it, and every shift lets your heat out. The SENTRY-2 is a sealed, full-body sack: climb in and your heat stays in, with the same reflective mylar built into tear-resistant ripstop that doesn't shred on first use. A blanket is better than nothing. This is better than a blanket.
How warm does it actually keep you?
It works by keeping the heat you already make: the lining reflects up to 90% of your body heat back at you while the shell blocks wind, wet, and ground chill — the three things that steal warmth fastest.
It is not an insulated four-season sleeping bag, and no palm-sized bivvy is — be wary of any that claims to be. Layered over clothing or used inside a car or shelter, it's designed to turn a dangerous night into a survivable one.
Is it reusable, or one-and-done?
Reusable. The ripstop material is made to survive actual use — climb out, shake it off, let it dry fully, and roll it back into the stuff sack. Cheap foil blankets usually tear the first time they're unfolded; that's exactly what the SENTRY-2 is built not to do.
Will it rip the first time I use it?
The shell is tear-resistant ripstop: the reinforcing weave stops small nicks from running into long tears the way plain mylar does. Sharp rocks and embers can still puncture it — clear the ground where you can, and a strip of duct tape patches a hole for the rest of its life.
How many do I need?
One per person, minimum — a bivvy is a one-person shelter, and in a stranded car or a blacked-out house every person needs their own. Then one for every vehicle: the glovebox is where a bivvy earns its keep, because breakdowns don't wait for good weather. For most households, the 5-Pack covers the family and the cars in one go.
I don't camp. Why would I need this?
Most cold-exposure emergencies don't happen on mountains. In the 2021 Texas freeze, 246 people died — most from hypothermia, many inside their own homes when the power grid failed. Add a dead car on a winter highway, a road closure in a storm, an evacuation with nowhere warm to wait, and "I don't camp" stops mattering. A bivvy in the drawer and one in the glovebox is a $20 answer to all of it.
Doesn't it get damp inside?
Mylar doesn't breathe — that's why it holds heat — so your breath and body moisture can condense inside overnight. Keep the opening loose around your face for airflow, vent it if you warm up, and let it dry fully before repacking. Damp and warm beats dry and hypothermic every time.
What if it's not for me?
Try it for 60 days. If you don't want it, send it back for a full refund — no forms, no questions. After that, it's covered for life: any defect, we replace it free.
