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Deuter Exosphere -10 sleeping bag review: roomier than it looks

The Deuter Exosphere -10 sleeping bag is a cosy synthetic three-season bag with extra fill in the footbox to keep toes toasty, plus water-resistant zones at each end to fend off damp tent walls

Deuter Exosphere -10
(Image: © Deuter)

Our Verdict

A thoughtfully designed bag with a mix of practical and innovative features designed to offer enhanced comfort and performance in real world conditions.


  • Warm
  • Moisture-resistant
  • Internal stash pocket


  • Comparatively heavy
  • Bulky

First impressions

Although the Deuter Exosphere -10, like all other Deuter’s Exosphere bags, has a slimline appearance, it's much roomier than it looks. That’s thanks to elastic seams that means they stretch up to 25% in width for added comfort. This also makes them more thermally efficient by eliminating dead space.

The generous amount of synthetic fill, snug collar, ergonomic hood, zip baffle and extra-thick padded footbox all make for a toasty bag that is ideal for cold sleepers. The women’s SL version even has additional fleece zones to ward off chills.

Other clever innovations include reinforced water-resistant panels to help protect the bag from damp, ideal if you use a bivvy bag or if you often wake up to find your head and feet touching the walls of your tent. 


RRP: £185 (UK)/€220 (Europe)
Weight: 1kg 885g/4lb 2.5oz (regular), 2kg 55g/4lb 8.5oz (large)
Length: 205cm/80.7 (regular), 220cm/86.6in (large)
Max user height: 185cm/6ft 1in (regular), 200cm/6ft 6.5in (large)
Pack size: 22x35cm/8.6x13.8in (regular), 23x36cm/19x14in (large)
Fill: Deuter Thermo ProLoft
Comfort limit: -4°C/25°F
Limit: -10°C/14°F
Compatibility: 3-season

On test

When you first climb into this bag, its elasticated chambers result in a slightly unusual body-hugging sensation that feels strange at first. However, it is very warm, making it ideal for cold sleepers.

The zip runs smoothly and doesn’t snag, even on the chunky full-length baffle. There’s also an inside pocket for stashing camera batteries or a smartphone, a useful feature that is often neglected.

Note that if you’re over 6ft tall you’ll struggle to fit in this bag, so go for the recently released long-length version (not available at time of testing). The other drawback is that it is relatively heavy and bulky when packed. Not a problem, of course, if you’re car camping, so this is a great bag for use on a campsite.

An outdoors writer and editor, Matt Jones has been testing kit in the field for nearly a decade. Having worked for both the Ramblers and the Scouts, he knows one or two things about walking and camping, and loves all things adventure, particularly long-distance backpacking, wild camping and climbing mountains – especially in Wales. He’s based in Snowdonia and last year thru-hiked the Cambrian Way, which runs for 298 miles from Cardiff to Conwy, with a total ascent of 73,700 feet – that’s nearly 2½ times the height of Everest. Follow Matt on Instagram and Twitter.