Core 950 Down Sleeping Bag

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UOG TOP PICK: Engineered for extreme conditions, the Core 950 Down Sleeping Bag Sleeping Bag combines cutting-edge warmth, lightweight design, and sleek aesthetics—the ultimate ally for high-altitude and cold-weather adventures and a top pick.

Pajak says: 

Core 950 sleeping bag is a high-quality, winter-specific sleeping bag designed for extreme temperature conditions. It is ideal for use on expeditions and other outdoor adventures in cold weather, and is guaranteed to keep you warm even in temperatures as low as -39°C.

Our Verdict

The Pajak Core 950 Down Sleeping Bag is a powerhouse for those who need serious warmth in harsh winter environments. With 700 fill power Polish white duck down, it offers a comfort rating of -10°C and a comfort limit down to -18°C, making it an ideal choice for high-altitude treks or deep winter expeditions. The bag’s weight is surprisingly light for its warmth, with the regular size at 1,420g, and it packs down reasonably compact.

Constructed with durable Toray Airtastic fabric and reinforced with water-resistant panels at the feet and head of the bag, it handles damp conditions well. The Z-shaped baffle design helps maintain even warmth distribution, reduces down migration, and prevents cold spots—a thoughtful touch that makes a noticeable difference in sub-zero temperatures.

The Pajak Core 950 Down Sleeping Bag excels in warmth and comfort, especially on long, cold nights. Its generous mummy shape provides enough space to move without feeling constricted while maintaining close body contact for optimal heat retention. The inner lining is soft to the touch and comfortable. 

The well-designed hood and adjustable drawcords seal in warmth around the face. The foot box is shaped to allow for natural foot positioning, enhancing comfort even when wearing extra layers or booties.

For its weight, the Core 950 offers an impressive balance of snug fit and ample room where needed, helping to make high-altitude and winter camping as comfortable as possible.

– Reviewed by Ultralight Outdoor Gear

Features

• Designed for winter expeditions. It’s impressive extreme temperature of -39°C EN13537 will keep You warm in most hostile conditions. A must have equipement on your expedition check list.
• The sleeping bag is constructed with high-quality materials and features a comfortable, insulated interior that will keep you warm and cozy throughout the night. It is also equipped with a durable, water-resistant reinforcement pannels that will protect you from the elements, making it a reliable choice for any winter expedition.
• Overall, Core 950 is a must-have piece of equipment for any adventurer looking to stay warm and comfortable in the most hostile conditions.
• Core 950 sleeping bag is a high-quality, winter-specific sleeping bag designed for extreme temperature conditions. It is ideal for use on expeditions and other outdoor adventures in cold weather, and is guaranteed to keep you warm even in temperatures as low as -39°C.
• Internal/external hang loops
• Inside pocket
• Non blocking zipper

Specifications

Temperature Rating

• EN13537:2012 Comfort: -10°C
• EN13537:2012 Comfort Limit: -18°C
• EN13537:2012 Comfort Extreme: -39°C

Regular Specs

• Weight: 1420g  (excluding bag)
• Fits up to: 180cm
• Inner length: 200cm
• Outer length: 216cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 10 Litres

Long Specs

• Weight: 1540g (excluding bag)
• Fits up to: 205cm
• Inner length: 224cm
• Outer length: 240cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 10 Litres

Material & Construction

• Fabric: TORAY® Airtastic SLF15 DWR
• FILL: 700 FP RDS Polish White Duck Down
• Fill Weight: 1050g (Regular)
• Baffle Construction: Z – Very light and warm construction. The baffle between chambers is angled which makes it warmer than popular ‘H’ construction. Best for all season sleeping bags.

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Pajak
• The EN13537 Standard
• All About Down