?️ Temperature Rating: Don’t Trust “Extreme”. Trust “Comfort”.
Extreme -10°C → You won’t die. You won’t sleep either.
Comfort 0°C → This is the number that matters.
Upper limit 10°C → Unzip it. Use it as a quilt. No sweat.
This bag: Comfort 0°C (standard).
Spring and autumn, it’s your main. Summer? Full zip, open like a duvet. Winter? Layer another bag over it. Instant double‑walled warmth.
One bag, three seasons. Not marketing. It actually works.
? Fill: Goose Down or Tech Synthetic
800FP Hydrophobic White Goose Down (Down version)
800+ fill power. 95% down content. Zero quills.
Hydrophobic treatment—morning condensation, tent dew, that one time you knocked over your water bottle. Down clusters stay separate. Dry. Still lofty.
Compression ratio ≈ 1:5. Stuff sack: 13L. Hangs on your pack like a grapefruit.
Clo ≥ 3.0 (Tech Synthetic version)
Humid campsite? Don’t want to baby down gear? Budget‑conscious? This one’s yours.
80% warmth retention when wet. Down wet = wet rag. Synthetic wet = wring it out, still works tonight.
Fill weight reference (M):
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Comfort 0°C: Down 600g / Syn 800g
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Comfort -5°C: Down 800g / Syn 1000g
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Comfort 10°C (Summer): Down 300g / Syn 400g
? Cut: Mummy = Warmth. Envelope = Freedom.
Mummy · Differential cut
Wide shoulders, narrow hips, tapered foot.
Minimal dead air space = minimal convective heat loss.
Roll over? Bag rolls with you. No sausage‑wrap struggle.
Pre‑shaped foot box—feet lie flat. No curled‑up toes all night.
Envelope · Couple‑zip compatible
Fully unzipped = double bed size. Two identical bags zip together.
For couples. For parent‑kid campouts. For anyone who sleeps like a starfish.
Slightly less efficient than mummy. Much more liberating.
? Zipper & Draft Tube: Details Don’t Lie
Bidirectional YKK anti‑snag zipper
Zipper guard integrated. No fabric eating.
Open from inside. Open from outside. Need to pee at 3 AM? Kick the pull tab. No sitting up. No blind groping.
Full‑length draft tube + Velcro collar seal
Insulated baffle behind the entire zipper. Cold air? Detour denied.
Collar Velcro closed. Only nose exposed. Exhaled heat stays inside the hood.
Hood drawcord · One‑hand adjustment
Tilt your head. Pull the cord. Cold air locked out.
No sitting up. No blanket shuffle. No finger‑blowing to warm your hands.
? Pack & Store: What You Do After the Trip Matters
Compression sack included · Daisy chain webbing
Roll. Push. Compress. From basketball to grapefruit.
Web loops — clip it outside your pack. Main compartment stays free.
Storage bag: mesh, breathable
Never store compressed. Loft doesn’t come back from the dead.
Shake it out. Hang it in the closet. Let it breathe until next trip.
Machine washable (down version: special detergent only)
Care label says: Low‑heat tumble dry + 3 clean tennis balls. Loft restores.
Don’t dry clean. Solvents strip down’s natural oils.
? Spec Check (0°C Mummy Example)
| Spec | Detail |
|---|---|
| Comfort rating | 0°C (-5°C ~ +10°C adaptive) |
| Fill | 800FP Hydrophobic White Goose Down / Tech Synthetic |
| Fill weight | 600g (M, down) |
| Shell | 20D ripstop nylon + DWR |
| Lining | Skin‑friendly polyester, cold‑to‑touch? No. |
| Zipper | YKK bidirectional anti‑snag |
| Draft tube | Full length + Velcro collar seal |
| Foot box | Pre‑shaped, ergonomic |
| Packed size | ~30×18cm (compressed) |
| Open size | 210×80×50cm (shoulder/hip/foot) |
| Weight | ~1050g (down) / 1350g (syn) |
| Pack method | Compression sack + mesh storage bag |
| Colors | Dusk Blue / Taupe / Forest Green |
? Who Needs This Bag?
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3‑season backpackers: 0°C is the line. Colder? Add layers. Warmer? Zip open.
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Humid‑climate campers: Tech synthetic version. No panic when the tent sweats.
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Couples / parent‑kid campers: Envelope version. Unzip fully. Zip together. Zero cold seam.
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One‑bag‑for‑all minimalists: Comfort -5°C version. Winter layer. Summer blanket. Done.
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Aggressive sleepers: Envelope. You starfish? It forgives you.
One last thing:
Your tent is your house in the wild.
Your sleeping bag is the only room that’s fully yours.
