Inner fabric

All sleeping bag inners are made from highly breathable, robust Vapour Vent (V2) fabric. We use three weights of V2 fabric: V2-15, V2-30 and V2-50 denier. The tight weave of the fabrics make them ‘downproof by construction’: coatings (which can affect breathability) are not required. A non-downproof version of V2-30 is used in our synthetic range.

Draft tube and neck muff

One Planet sleeping bags use dual, D-shaped, three-dimensional draft tubes to stop any cold breezes at the zip. (The Robin Hoodless and Stowaway have a single draft tube, while the Booster bags don’t have any.) Fabric near the zip is firmly sewn-off to prevent the slider snagging.

All One Planet bags (except the Booster, Robin Hoodless and Stowaway) have three-dimensional neck muffs: an elasticised collar that works independently to the hood, stopping warm air escaping from the neck and shoulders when you move during the night.

Internal security pocket

All One Planet sleeping bags have an internal zippered security pocket. It is the perfect size for keeping your passport, cash, small electronics and other vital items out of harm’s way while you sleep. In sub-zero temperatures the pocket is also fantastic for keeping batteries operational and contact lenses from freezing.

Zips

All One Planet sleeping bags use YKK zips, because the last thing you need is a busted zip… The zips are bi-directional, with twin zip sliders allowing you to vent the bag from the foot on balmy nights. (The exceptions are the Cocoon, which only has a half zip, the Winter Lite where the zip does not go across the feet, and the Stowaway and Booster which have one-way, continuous zips.)

Providing you have a left- and right-hand zip opening, most of the range will zip together. (However, joining two bags together will actually decrease their thermal efficiency. Cocoon, Stowaway, and Booster bags will not zip to each other, or any other bag.) The zip pulls glow in the dark to save fumbling in the dark, while fabric near the zip is firmly sewn off to prevent the slider snagging.

One Planet mummy and tapered rectangular bags have ground-level zips and seams, with the vertical baffles wrapping right over your body to the ground. In contrast, the side seams of conventional bags are at the midpoint of the bag, allowing the insulation in the bottom of the bag to fall down away from the seam, creating cold spots.

Differential cut

All One Planet sleeping bags have a differential cut, with the inner fabric cut narrower than the outer shell. This reduces fabric waste, promotes proper lofting of the down, and protects the fill from compression.

Hood and foot

‘If your feet are cold, put on a hat.’ So the saying goes, and if you substitute hood for hat, you’ll understand why we go to so much effort. The hoods on all mummy and tapered rectangular bags are shaped to contour to the head, leaving only the nose and mouth exposed. They integrate with the neck muff and shoulders and can be cinched tight without compressing the fill. Three-dimensional foot cavities are used on all One Planet mummy and tapered rectangular bags (except the Stowaway), preventing your toes from compressing the down and causing cold spots (and cold toes!)

Pillow slip

The Bush Lite, Cocoon, Winter Lite and Zephyr all come with a pillow slip that simply clips into position. Fill it with spare clothing to make the perfect camping pillow, and throw it into the washing machine when it gets dirty.

One Planet’s use of technical innovation and constant refinement to create exceptional products is exemplified by our sleeping bag shells. More than 30 years of design and testing has been devoted to developing the optimum sleeping bag shell.

The most important job of the shell is to keep the fill in position. This is done through a complex series of compartments called baffles: without these, the fill could move away from high points on the body, leaving you cold in the wee hours.

All One Planet down sleeping bags (except the Booster Bag series) use sewn-off box wall baffles made from Baffletex. This air-permeable fabric is extremely strong and lightweight, but it also has many other features. Baffletex’s one-way stretch prevents the baffle from tearing when stressed – it acts as a shock absorber within the bag, preventing baffle blow-outs and resulting damage to the bag. Our bags are sewn with 13 stitches per inch, minimising fill leakage and increasing strength.

Vertical chest baffles

Our more technical bags use the One Planet vertical baffle system, designed to stop fill from shifting (intentionally or otherwise). By incorporating a differential cut with a vertical baffle system, a series of radiating offset baffles are created, reducing baffle waste while keeping the down in the right place. (Either horizontal or V-baffles are used in other areas of the bag.)
This baffle system ensures the calculated amounts of down are kept in the correct areas, optimising the bags’ warmth-to weight-ratios. Vertical baffles over the chest also prevent down from falling from the top to the bottom unintentionally during the night, which causes cold spots.

Vertical chest baffles are used on the Bungle, Bush Lite, Cocoon, Winter Lite and Zephyr bags, helping you to stay warm all night. All baffles are also sewn off, further preventing fill movement. One Planet sleeping bags were the first in Australasia to sport this then revolutionary feature.

One Planet V-shaped baffles

V-shaped baffles are used on the Booster, Camp Lite, Robin Hoodless and Stowaway. They keep the down in place more effectively than traditional horizontal baffles, making it harder for the fill to move unintentionally and cause cold spots. The down can still be shaken and padded from the top of the bag to the base to alter the insulation spread as conditions dictate.

Some years ago, Dr Ken Green of Berridale, NSW, performed an interesting experiment. To quantify the difference between V-shaped and conventional horizontal baffle systems, two sleeping bags were made, identical in fill and fabric. The only difference: one bag featured One Planet's V-shaped baffles, the other had conventional horizontal baffles.
Over the course of two evenings, Dr Green took 800 paired temperature records, comparing the outside ambient temperature with the temperature inside the bag.

Around midnight, the temperature in both bags was 31–35°C warmer than the ambient temperature. As the night wore on and the outside temperature fell, the bag with conventional baffles maintained this difference in temperature. However, as the pre-dawn minimum of -5.8°C approached, the bag with V-shaped baffles kept the user up to 39.5 °C warmer than the ambient temperature.

In other words, through the course of the night the V-shaped baffles prevented the fill from moving, keeping it where it was needed and the user up to 4.5 °C warmer than the conventional bag.

Mummy shaped bags

The Cocoon and Winter Lite are One Planet’s mummy-shaped bags, and the most thermally-efficient bags in our range. Designed to hug your body shape, these bags give the most warmth for their fill but have the least internal space. A combination of vertical and horizontal baffles is used, preventing the fill from shifting during use. The vertical chest baffles, which run from the neck to the waist, prevent the down from drifting from the highpoints of the bag (created by your torso) down to the sides of the bag during the night, causing cold spots. The baffles are also ‘sewn-off’, which prevents the fill from moving from the top to the base of the bag. However, this means the fill cannot be shifted as conditions dictate. The Winter Lite has a zip which runs the full length of the side whilst the Cocoon only has a half zip.

Tapered rectangular

The One Planet tapered rectangular bags provide a combination of efficiency and comfort, allowing more wriggle room and versatility but with an increase in size and weight. Most of our tapered rectangular bags use vertical chest baffles to keep the fill where it is needed. However, the Booster, Camp Lite and Stowaway use V-shaped baffles, which prevent the down from moving more efficiently than the traditional horizontal baffle while still allowing it to be moved within the bag to suit conditions.

The One Planet tapered rectangular range includes the Booster, Bungle, Bush Lite, Camp Lite, Stowaway and Zephyr down bags, as well as the whole synthetic range.

Rectangular bags

Rectangular bags are spacious and comfy, with the good old rectangle providing extra space for those who really like to move. Our versatile, cosmopolitan Robin Hoodless is designed for car-based camping or travelling where packed size and weight are less of an issue. In these conditions, there’s no need for a technical hood so we’ve removed it – the hood is a sleeve only, so a pillow can be inserted and will definitely stay put. V-shaped baffles help prevent the down from shifting unintentionally, whilst it can still be moved from top to bottom as conditions dictate. When unzipped, this style of bag makes a great queen-size doona: perfect for when you’re staying put for a while and want the comforts of home.