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.