Zephyr -4

Product No:

From $449.00
- This product is currently out of stock

*Many One Planet sleeping bags are made to order in their Melbourne factory! - Orders of these bags may take 7-10 business days to arrive in store*



This is a very versatile lightweight bag; it's warm enough for most outdoor encounters yet not too hot for those balmy nights. The Zephyr shell is perfect for the all-round adventurer wanting to shed weight while still having room to move.

The more relaxed tapered rectangular shape adds wriggle room and versatility.
The combination of vertical and cross baffles stops unintentional down movement.
Filled with One Planet's water-repellent DWR DOWN; choose between 700+ or 800+ loft.
The highly breathable and lightweight 15-denier Vapour Vent makes a silky inner and outer fabric.
Three-dimensional hood and foot increase comfort and warmth.
The 3D neck muff and twin draft tubes on the zip keep warm air in.
 Zips can be opened fully for more versatility.
Added luxury of a removable pillow slip.
Available in small, regular and large sizes.



Bag weight (g) with 800+ loft DWR DOWN
 S: 860
R: 940
L: 1010
Bag weight (g) with 700+ loft DWR DOWN
 S: 910
R: 1000
L: 1075
Inner and outer fabric
 15 denier Vapour Vent
 Tapered rectangular
Foot type
 3D taper
 Vertical and cross
Temperature ratings, ºC
 2 comfort, -4 limit of comfort, -20 extreme
   Season rating
Possible uses
Ultralight bushwalking all seasons
 S: right
R: left, right
L: left

Sizes (user height x shoulder circumference, cm)
 S: 175 x 146
R: 185 x 160
L: 200 x 168
S, L: grey/mango
R: blue/grey, grey/mango
Stuff sack capacity (litres)
S: 4
R, L: 6



Additional information from manufacturer


One Planet DWR DOWN


Down is the best insulation for lightweight camping gear due to its loft, compressibility and durability. However, this golden fibre has a failing: its ability to insulate drastically decreases when it is wet.

The solution is now here – DWR DOWN. This down has been selected to meet our rigorous standards, with a durable water-repellent (DWR) treatment applied after the cleaning and sorting process.

The benefits of DWR DOWN are:

It absorbs less water in damp conditions.
It retains higher loft (insulation) in damp conditions.
It dries faster.

One Planet offers a choice between 700+ and 800+ loft down

This gives our customers more choice regarding weight and price. Higher loft down provides better insulation so less filling is required, but it is more expensive. Lower loft down is less expensive, but more filling is required to achieve the same temperature rating. We leave the decision to you.



Sleeping bag fabric must perform a number of roles: keep the fill in the bag; allow body generated moisture to get out; and the shell fabric must also keep external moisture out in some conditions.

Fabrics that are ‘downproof by construction’ are ideal as they don’t use coatings which can reduce breathability: instead, the very tight weave prevents down from escaping.

Vapour Vent (V2)

Vapour Vent (V2) is used as the inner in all One Planet sleeping bags and as the shell for most. This durable, tightly-woven fabric is ‘downproof by construction’: the weave is so tight down cannot escape through the cloth. Coatings are not required, so body vapour can vent through the fabric more effectively, reducing moisture build-up in the down and allowing it to loft to its full potential. We use three weights of the silky V2 fabric, differentiated by their denier. (The fineness of thread is measured in denier: the finer the thread, the lower the denier and the lighter, more silky and expensive the fabric.)


An ultralight, 15-denier nylon used to make light, high-performance bags. Used on our Booster, Cocoon and Zephyr bags, as well as the inner on the Bush Lite and Winter Lite, it offers the ultimate in luxury and warmth-to-weight ratios.

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