Thermarest Ohm 20F Down Sleeping Bag

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UOG TOP PICK – Thermarest Ohm 32 UL Sleeping Bags – a hoodless bag that converts into a quilt, made with super high quality 900+ fill power down and box wall quilting its an amazing summer+ season bag for a more relaxed backpacker!

Thermarest says

When you need ultralight weight and packability, but can’t go without warmth and comfort, the Ohm 20F/-6C is hard to beat. Weighing in at just 1 lb. 6 oz (635g), the Ohm sleeping bag brings balance to backcountry pursuits with a roomy fit and the ability to convert into a two-person quilt. Filled with high-loft 900-fill Nikwax Hydrophobic Down™, it delivers top-notch warmth-to-weight performance with moisture-resistant insulation that dries fast and compresses small. Thermally efficient box baffled construction maintains consistent warmth distribution while heat-mapped Zoned Insulation prioritizes key warmth areas. Ultralight shell fabric and high-loft down keeps overall weight and packed size to an absolute minimum. Unique in its class, a full-length zipper extends completely around the footbox, allowing it to be opened flat as a quilt for added comfort and mobility on warm nights. Two fully unzipped Ohms can be stacked and zipped together to create a comfy double bag for adventure duos. Designed with the Therm-a-Rest commitment to quality and performance, the Ohm keeps your pack featherweight and versatile without sacrificing an ounce of performance.

Our Verdict

The Ohm 20f is a standout bit of kit, almost a hybrid between a sleeping bag and a quilt, it offers serious protection in colder conditions ( I’ve had it out in sub 0, but wouldn’t want to push it much past that), and fantastic heat regulation in the warmer months, meaning this bag is my go-to in all but the depth of winter.Incredibly light thanks to the 900 Fill Goose down, pretty much the highest quality of down Thermarest offers, this packs down to almost nothing, meaning you can really save on space by potentially bringing a smaller rucksack, which again could save you weight.

Its definitely not as luxurious as some of its counterparts, no hood, primarily to save weight and a rather narrow foot box make this a minimalist bag. A drawstring around the opening can be a little difficult to use when in the bag, but once adjusted heat loss is negligible. The lack of a hood could put some off, but I have found it rather freeing, on very cold nights its definitely advisable to have a warm beanie close to hand. Yet on warmer nights I definitely don’t miss it, and also find I don’t wake as often to find I’ve shifted the hood right round due to nocturnal gymnastics. I’m 6 foot and I find this bag still has some wiggle room for me and don’t find it constricting despite the narrow foot box, and i find this bag is as good for side sleepers as for those who sleep on their back or front.

The full-length zip means it can be opened out into a blanket if that suits your sleeping style, however, I prefer to zip it almost all the way but not quite, effectively giving myself a toe box similar to that which you find in some quilt designs. So all in all, from when the first buds appear, till the last leaf falls from the tree, this is the bag for me.

– Reviewed by Ultralight Outdoor Gear

Features

• Ultralight: One of the lightest pieces in its class, the Ohm sets the weight standard for high-performance outdoor equipment. 
• 900 Fill Nikwax Hydrophobic Down™: Responsible Down Standard certified, it absorbs 90% less water and dries 3x faster without using dangerous PFCs for better performance in wet weather.
• Roomy Fit: Semi-rectangular shape cuts weight and allows for a spacious and warm night at camp. 
• High-Utility: Full-length zipper allows for use as conventional sleeping bag or fully unzip it for a blanket on warmer nights.
• Pairable: Stack two fully unzipped Ohms and pair them for a cozy two-person sleeping bag. 
• Warm Features: Box baffled construction uses mesh walls to maximize loft and minimize cold spots, while a draw cord at the collar seals in heat. 
• Unrivaled Packability: Lightweight materials and precise design allow for a smaller packed size than ever before.
• Compression sack and storage sack included.

Specifications

Regular

• Fits: 169-183cm (5ft 7in-6ft)
• Girth: 157cm at shoulder, 142cm at hip, 89cm at foot
• Fabric: 10D Nylon RipStop w/DWR / 10D Nylon RipStop
• Fill: 900 Fill Goose Nikwax Hydrophobic Down™, RDS
• Fill weight: 355g
• Pack size: 17 x 20 cm
• Comfort rating: 0°C / 32°F
• Comfort Limit: -6°C / 20°F
• Weight: 646g (excludes storage bags)

Long

• Fits: 184-198cm (6ft 1in-6ft 6in)
• Girth: 168cm at shoulder, 150cm at hip, 97cm at foot
• Fabric: 10D Nylon RipStop w/DWR / 10D Nylon RipStop
• Fill: 900 Fill Goose Nikwax Hydrophobic Down™, RDS
• Fill weight: 387g
• Pack size: 17 x 20 cm
• Comfort rating: 0°C / 32°F
• Comfort Limit: -6°C / 20°F
• Weight: 704g (excludes storage bags)

Help and advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Thermarest
• Thermarest Sleeping Bags Explained
• The EN13537 Standard
• All About Down
• Responsible Down Standard
• Hydrophobic Down
• Why is ‘PFC Free’ Important?