DownTo1 Packs

The engine's answer

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

Mammut

Perform Down −7 °C

Alpine-leaning down with a shell built for damp bivouacs.

  • Cold-weather rating at a carryable weight
  • Water-repellent shell and treated down
  • Well-designed hood for hood-up sleeping
  • Expensive
  • Cut is snug for broader sleepers

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

Why it wins, in numbers

Mammut Perform Down −7 °C is the sleeping bag the engine picked for this trip: €400 and 1.05 kg, Comfort rating -7 °C, a 74% match on the questions asked. The kit around it comes to €670 of the €700 ceiling, leaving €30.

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 43 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.

4.40 kg on your back · €670 of a budget of €700

Tent
3F UL Gear Lanshan 2: €130, 1.10 kg, Season rating 3, 50% match.
Sleeping bag
Mammut Perform Down −7 °C: €400, 1.05 kg, Comfort rating -7 °C, 74% match. Strongest on: Fill.
Sleeping mat
Naturehike R5 Insulated: €80, 750 g, R-value 5.0, 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.

  • Alpkit PipeDream 600Winter down at a price that still looks like a mistake.Alpkit PipeDream 600 — €360, 1.15 kg — gives up Weight: 1.15 kg against the winner's 1.05 kg. It scores 70% to the winner's 74%.
  • Warmpeace Viking 600Czech-made down that quietly undercuts the better-known brands.Warmpeace Viking 600 — €330, 1.15 kg — gives up Fill power: 700 against the winner's 800. It scores 68% to the winner's 74%.
  • Forclaz MT900 −10 °C DownThe cheapest genuine winter down bag on the list.Forclaz MT900 −10 °C Down — €300, 1.40 kg — gives up Weight: 1.40 kg against the winner's 1.05 kg. It scores 60% to the winner's 74%.

Questions this trip raises

How much does the whole kit cost?
€670 for all four items, €30 under the €700 ceiling. Prices are indicative euro list prices; the shops set their own.
How much does it weigh?
4.40 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 Mammut Perform Down −7 °C 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.