Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C

Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C

UL250 (250 g)
$249.00 AUD
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Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C
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  • Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C
  • Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C
  • Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C
Ultralight Summer Down Sleeping Bag UL250 — 250 g of 90/10 Down, 500 g, Comfort 15 to 20°C

Down Sleeping Bag Ultralight Summer Down Sleeping Bag UL250

Half a kilo of summer bag that packs to the size of a drink bottle.

$249.00 AUD
Down
250 g, 90/10
Bag weight
500 g
Packed
20 × 13 cm
Full specification
ModelUL250 (250 g)
  • Tracked delivery Australia-wide, A$19.95 on orders from A$100 (A$9.95 under): 1–3 business days to dispatch, then 10–20 business days on the way. Order a month before your trip. Shipping
  • 30-day returns. We pay the postage if it's faulty or not as described. Returns
  • Every figure on this page is the maker's own or our clearly labelled guide. No made-up lab ratings.

The UL250 is a 210 × 75 cm mummy with 250 g of water-repellent 90/10 duck down, weighing about 500 g and packing to about 20 × 13 cm. The maker states 800+ fill power and rates it comfort 15 to 20°C, limit 5 to 10°C.

It's the bag for summer walks where every gram counts, and it doubles as an inner layer in a winter system.

Warm-weather hiking, without the bulk.

Best for
Summer hiking, tropical and coastal trips, and as the inner layer of a two-bag system in winter.
Think twice if
It's a summer bag: below about 12°C you'll be cold on its own. For three seasons, choose the Goose Down Mummy Sleeping Bag.

  • 500 g all up

    Light enough that you stop noticing it in the pack.

  • Packs tiny

    About 20 × 13 cm in its compression sack.

  • A true summer bag

    The maker rates it comfort 15 to 20°C. Add a liner for cooler nights.

Warm enough for your trip?

Plan on the “warm to” figure: our own cautious guide, or the maker's comfort rating where that's what we quote. If you sleep cold, or you're not sure, add 5°C. And if you're torn between two bags, take the warmer one: a bag that's too warm, you unzip; one that's too cold, you can't fix at 2 am.

Compare it with every bag we sell
  • UL250 Comfortable to about 15°C If you sleep cold, about 20°C

Is it the right bag for your trip?

Pick the coldest night you expect. We'll show every bag and quilt that's warm enough, lightest first, and mark this one if it makes the cut.

How cold will your coldest night be?
  1. UL250This bag Warm to 15°C 250 g A$249
  2. Cozy 300 Warm to 3°C 400 g A$299
  3. Envelope 400 g Warm to 10°C 400 g A$229
  4. Mummy 400 g Warm to 8°C 400 g A$259
  5. Envelope 600 g Warm to 5°C 600 g A$259
  6. Mummy 600 g Warm to 3°C 600 g A$289
  7. Mummy 800 g Warm to −1°C 800 g A$329
  8. Mummy 1000 g Warm to −5°C 1,000 g A$369
  9. Mummy 1200 g Warm to −8°C 1,200 g A$399

of our bags and fill weights will keep you warm enough. Lightest first, so the top one is the lightest that will do the job.

Read the full guide: trips, safety and what else to pack

  • Plan for the coldest night

    Hills, valleys and inland camps get much colder than the forecast for the nearest town. Check the overnight low for where you'll actually sleep.

  • If in doubt, go warmer

    Being too cold at night isn't just a bad night's sleep. A long, cold night in a bag that's too thin can tip into hypothermia, and there's no fixing it at 2 am.

  • The mat matters as much as the bag

    Down underneath you is crushed flat, so the ground steals your heat. Below freezing, use an insulated mat with an R-value of 4 or more.

  • Help the bag help you

    Change into dry clothes, eat something before bed, and wear a beanie. A bag holds warmth in, but it can't make it.

Where it sits

Where it sits among every bag we sell, by grams of down

Choose by your coldest night

Highlighted: UL250 (250 g). The other marks are our other bags and fill weights.

The numbers

Taken from the maker's own listing and spec cards for this exact model; anything marked our guide is ours. Where the maker doesn't publish something, the line is left out rather than guessed.

250 gDown fill
500 gTotal weight
15°CWarm to (see note)
Down250 g of 90/10 duck down with a water-repellent treatment; the maker states 800+ fill power
WeightAbout 500 g (maker's figure)
Temperature (maker)Comfort 15 to 20°C
Limit 5 to 10°C
Size210 × 75 cm mummy
Shell and lining380T 20D nylon shell; 380T 15D nylon lining
PackedAbout 20 × 13 cm; mesh storage sack and compression sack included

“Warm to” is the figure we'd plan on: our own cautious guide, or the maker's comfort rating where that's what the table quotes. About the temperatures: The maker's figures, not independently lab-tested. Brands like Sea to Summit pay for an independent EN/ISO 23537 test; nobody has done that for this bag, and we won't pretend otherwise. So compare on grams of down and bag weight first: they're physical quantities. How to read them

Complete your sleep system

A bag is half of a warm night. Here's what else makes it work, and what people usually add.

  • Ultralight Sleeping Bag Liner — Keeps Your Bag Clean, Adds a Little Warmth, Packs to a Fist
    Ultralight Sleeping Bag Liner

    The cheapest way to make a down bag last longer: sleep in this, wash this.

  • Egg-Crate Foam Sleeping Mat — R 2.5 With Reflective Foil, 330 g, Folds to 56 × 14 cm
    Egg-Crate Foam Mat

    The mat that can't go flat: closed-cell foam, R 2.5, and light enough to strap on anywhere.

  • Inflatable Camp Pillow — Soft Flocked Top, Folds Into a Pocket-Size Pouch
    Inflatable Camp Pillow

    A light, soft-topped air pillow that folds into a pocket.

  • Trekking Pole Tent 1–2 Person — 1.38 kg, Two Doors, 15 cm Bathtub Floor, PU 2000 mm
    Trekking Pole Tent 1–2P

    A double-door A-frame that uses your trekking poles as its frame, so there are no tent poles to carry.

A mat rated for the season

The ground takes more heat than the air, and down underneath you is crushed flat. As a rough guide: an R-value of about 2 for summer, 3 to 4 for three seasons, and 5 or more on snow.

A way to keep it dry

Wet down stops insulating. Pack the bag in its compression sack inside a dry bag or pack liner, and air it out when you reach camp.

Questions

Can I use it in winter?
Only inside another bag. On its own it suits nights of about 12°C and warmer.
Which size should I buy?
As a rule, pick a bag at least 15 cm longer than you are, so your feet don't press into the down and make a cold spot. The spec table above gives the length, or the height the maker says it fits. If you're between sizes, or like to sleep with a water bottle or clothes inside, go up.
Are the temperature ratings lab-tested?
No. Each temperature on this site is either the maker's own figure, labelled maker, or our own cautious guide, labelled our guide. None of these bags has an independent EN/ISO 23537 lab report, so we lead with fill weight and bag weight: physical quantities you can compare. Treat any temperature as a starting point and allow a margin, especially if you sleep cold.
Comfort, limit, extreme: which one do I use?
Comfort is the temperature a cold sleeper stays comfortable at; limit is where a warm sleeper, curled up, still sleeps. Extreme is survival only: never plan on it. Most people should plan on the comfort figure, and on a warmer mat than they think they need.
How do I store and wash a down bag?
Store it loose in its storage sack, not squashed in the compression sack. Wash it rarely, with a down-specific wash on a gentle cycle in a front loader, then tumble dry on low with two clean tennis balls until no clumps are left. It can take a few hours. A liner means you'll wash the bag far less often.
When will it arrive?
We dispatch in 1–3 business days, then it's 10–20 business days on the way to Australia. There's no warehouse or shopfront in between, which is why it takes longer and costs less. If you have a trip booked, order at least four weeks before you leave. You'll get a tracking number by email when the parcel is scanned. Full details on the Shipping page.
Will my order arrive in one parcel?
Gear from the same maker usually travels together. If your order has gear from more than one maker, it can arrive in two or three parcels, sometimes a few days apart. You'll get an email with a tracking number for every parcel, so you always know what's on the way.
Will I pay duty or GST on delivery?
No. Orders under A$1,000 clear into Australia without additional duty or GST, so there's nothing to pay when your parcel arrives.
What if it isn't right?
You have 30 days from delivery to return it unused and in its packaging. If it's faulty or doesn't match what we published, we pay the return postage and refund in full. See Returns.

More from this shelf

  • Tracked delivery Australia-wideA$9.95 on orders under A$100, A$19.95 from A$100. No duty or GST to pay on delivery.
  • Every number publishedGrams of down and weight on every bag, the R-value wherever the maker publishes one, capacity and weight on every pot, and a note wherever the maker's figures are unclear.
  • 30-day returnsUnused and in its packaging. We pay the postage if anything is faulty or not as described.
  • Replies within 24 hoursEmail us Monday to Friday and a person answers, not a bot or a call centre.