DownTo1 Packs

The engine's answer

Best synthetic sleeping bag in frosty nights near −5 °C, under €700

Carinthia

Defence 4

A military-derived synthetic bag built to be abused for years.

  • Cold-weather synthetic warmth
  • Extremely durable construction
  • Keeps working soaked, which is the whole point
  • Very heavy and enormous packed
  • Not a backpacking bag by any sensible measure

Find it at Bergfreunde · Trekkinn · Decathlon · Alpinetrek · eBay (used)

Why it wins, in numbers

Carinthia Defence 4 is the sleeping bag the engine picked for this trip: €280 and 1.90 kg, Comfort rating -7 °C, a 78% match on the questions asked. The kit around it comes to €700 of the €700 ceiling, leaving €0.

What the engine asked for: a sleeping bag rated to −7 °C or lower, a mat with an R-value of at least 4.5, a pack of at least 46 L, and €700 for all four; anything that falls short of these is flagged beside the item.

The kit it belongs to

Four items chosen together, not four separate winners. Swapping one moves the others.

4.85 kg on your back · €700 of a budget of €700

Tent
3F UL Gear Lanshan 2: €130, 1.10 kg, Season rating 3, 50% match.
Sleeping bag
Carinthia Defence 4: €280, 1.90 kg, Comfort rating -7 °C, 78% match. Strongest on: Fill.
Sleeping mat
Therm-a-Rest NeoAir XLite NXT: €230, 354 g, R-value 4.5, 50% match.
Backpack
Forclaz MT100 Easyfit 50: €60, 1.50 kg, Capacity 50 L, 50% match.

What the runners-up gave up

Each of these still leaves a kit that closes — the budget holds and the pack shuts. This is where each one lost.

  • Robens Gully 600Cold-weather down at a price that keeps its head down.Robens Gully 600 — €260, 1.40 kg — is worse on no single spec, but scores 20% to the winner's 78% on the questions asked.
  • Forclaz MT100 15 °CThe cheapest thing here, and honest about what it is.Forclaz MT100 15 °C — €35, 800 g — gives up Comfort rating: 15 °C against the winner's -7 °C. It scores 55% to the winner's 78%.
  • Forclaz MT500 10 °CA cheap, cheerful summer bag that does not mind getting damp.Forclaz MT500 10 °C — €60, 900 g — gives up Comfort rating: 10 °C against the winner's -7 °C. It scores 54% to the winner's 78%.

Questions this trip raises

How much does the whole kit cost?
€700 for all four items, €0 under the €700 ceiling. Prices are indicative euro list prices; the shops set their own.
How much does it weigh?
4.85 kg base weight — tent, sleeping bag, mat and pack together, before food, water and clothes. The pack is rated to carry 16 kg comfortably.
Is Carinthia Defence 4 warm enough for −5 °C nights?
Its comfort rating is -7 °C. For nights near −5 °C the engine requires a rating of −7 °C or lower, which it meets.

Change an assumption

This page answers one trip. Yours is not that trip — adjust the nights, the budget or the company and watch all four re-rank.

Build my kit

Specifications are manufacturers’ own published figures and prices are indicative, not live. Comfort ratings and R-values are comparable across brands but describe a standardised sleeper on standardised ground — neither is a promise about you on a particular night. Check the current spec and price with the retailer before buying.