Northern Warmth Envelope Down Sleeping Bag
Northern Warmth Envelope Down Sleeping Bag
Free tracked UK delivery · 30 days to return · VAT included
Dispatch in 1–3 working days · UK delivery 7–14 working days · tracked from dispatch
A rectangular down bag for people who cannot sleep wrapped tight. It opens flat as a quilt, and two of them zip together into a double — which is what makes it the bag couples and van campers actually keep.
What the manufacturer states
- Insulation: white goose down
- Shell and lining: 400T 15D water-repellent nylon
- Shape: envelope, opens flat
- Size: 200 × 80 cm (Military Green: 200 × 73 cm)
- Joins: two bags zip together into a double
Choosing the fill weight
Our own guidance, not a tested rating. An envelope bag has more air inside it than a mummy, so it needs a little more down for the same night.
- 300 g — summer, festivals, indoors.
- 400 g — British spring and autumn.
- 600 g — cold autumn nights and van use in winter.
No temperature rating
This bag has not been laboratory-tested to ISO 23537, so we do not print a comfort figure. Here is why.
No temperature rating
A number we did not test is a number we will not print.
This bag has not been laboratory-tested to ISO 23537, so a comfort figure would be a guess dressed up as data. Across this price band you will find the same physical bag advertised as −10 °C by one shop and −20 °C by another.
Use the fill weight instead. It is measurable, it is on this page, and it compares directly against bags that have been tested.
Read our full position
Straight talk
It ships from our partners in Asia, and it is priced accordingly.
That is why the same specification costs less here than on the high street, and why it takes 7–14 working days instead of two. Tracked the whole way, taxes settled at checkout, nothing to pay at the door.
Finish the system
A bag is half of it.
Down compressed under your body loses almost all its loft, so the underside of the bag insulates you barely at all. Without a mat, the ground takes the heat.
The ground
Sleeping Mats
An air mat lifts you off cold, wet ground and takes the lumps out.
Shop mats
Our position
No Invented Numbers
Why you will not find a comfort temperature anywhere on this site.
Read our position
Not sure yet
Fill Guide
Which fill weight suits which night, and how to look after down.
Read the guide