Thermarest King Solomon 20F Double Wide Sleeping Bag

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The King Solomon offers comfort-first sleep for two without compromise on warmth or weight.

Big Agnes says: 

Our King Solomon is part of our Doublewide Series, eliminating the need to zip two bags together so there’s nothing keeping you apart from your cuddle bug at camp. Lightweight and packable 650 Downtek™ PFC-Free water-repellent down insulation creates a sleeping bag for two at less weight and bulk than packing two separate bags. Our tried and true Pad Cinch System makes connecting two pads or securing a doublewide pad easier and faster than ever. Now with a full zip off option, you can use the top quilted layer like a comforter or zip together to create a single bag when camping solo.

Whether you need room for two, or just prefer sleeping in lightweight, packable doublewide luxury, the King Solomon 20° is the most versatile sleep system out there.

Our Verdict

The Big Agnes King Solomon 20F delivers exactly what a double bag should: generous space, reliable warmth and smart packability. The updated Cinch Pad Sleeve system neatly secures one double mat or two singles without fuss. The full-zip top section transforms it into a shared comforter or solo quilt, which works well for mixed setups or fluctuating temperatures.

The down insulation (650 fill) holds up well in cooler conditions, though; I’m not sure I’d push it to its -7°C rating. The wide cut through the shoulders and the dual entry points give it a relaxed, bed-like feel, while details like the oversized draft collar and interior hand pockets make it easy to settle in for the night.

Recycled fabrics, low-profile zip toggles and smooth construction reinforce the bag’s practical, environmentally conscious appeal. For couples looking to streamline their sleep system without sacrificing warmth or comfort, it’s a standout choice.

– Reviewed by Ultralight Outdoor Gear

Features

• Big Agnes down-fill doublewide bags are designed for two people and offer technical, roomy sleeping spaces for those who aren’t willing to sacrifice comfort or compressibility
• Featuring the Big Agnes PadlokTM Sleep System with Cinch Pad Sleeve
• Big Agnes PadlokTM Sleep System keeps your bag and pad connected so you can sleep comfortably without rolling off your pad
• Cinch Pad Sleeve adjusts to securely fit a variety of pad sizes
• Cinch Pad Sleeve includes middle secure point for maximized stability of two single pads or one doublewide pad
• Unique quilt-like design with 2 side zippers turns your bag into a backcountry bed
• Double zippers allow entry from either side of bag and when unzipped allows top of bag to be used like a comforter
• Use the top corner hand pockets to wrap the bag around your shoulders like you do with your comforter at home
• Zip off for separate quilt. Fold and zip quilt to make single bag
• Low profile cordlocks and internal drawcords around the hood opening allow each user to manage their own temperatureregulation
• Pillow Barn attached to pad sleeve allows for natural head movement while keeping a pillow (or jacket) securely in place
• Oversized draft collar and zipper draft tube seal in heat
• Anti-snag YKK #5 zippers for a smooth, quick zip
• Zipper garages
• Storage sack & stuff sack included

Specifications

• Weight: 1754g
• Temperature rating: -7°C / 20°F
• 2 Person: fits up to 6′ / 183cm
• Fill Type: 650 Downtek™ PFC-Free
• Fill Weight: 850g
• Pad Sleeve Type: Cinch Pad Sleeve
• Compressed Size:11″ x 14″
• Stuff Sack Size: 25 x 53cm

Material & Construction

Fabric

• Shell: Recycled 20D polyester ripstop with PFAS-free water-repellent finish
• Lining: Recycled 20D polyester taffeta with PFAS-free water-repellent finish

Insulation/Construction

• 650 fill Downtek™ PFC-Free repels water while maintaining insulating value – bluesign®
  approved PFAS-free water-repellent chemistry
• Baffled construction
• YKK #5 zipper

Sustainability Notes

• This product contains 100% Certified RDS Down Certified by Control Union CERT 879262
• Recyled fabrics
• PFAS-free fabric finish
• Downtek™ PFC-Free uses bluesign® approved PFAS-free water-repellent chemistry

Pad Size Needed

• Works with one Doublewide pad or two singlewide pads up to 60” x 78” / 152cm x 198cm. Ideal pad size 40” x 72” / 102cm x 183cm
• Rectangular shape recommended

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• The EN13537 Standard
• Down Quality
• All About Down
• Hydrophobic Down
• About Big Agnes
• Big Agnes Sleeping Bags Buying Guide
• Why is ‘PFC Free’ Important?
• What is Bluesign?