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Sea to Summit Treeline Series - Down Insulated Sleeping Bag

Original price $319.99 - Original price $319.99
Original price
$319.99 - $319.99
Current price $319.99

Afterpay or Zip available

Model: ATL1-Regular

Made for ultimate durability and warm weather adventures.  

The Treeline Series Down Insulated sleeping bag is a multipurpose bag that’s perfect for 3 seasons of the year. If you’re confident that the temperatures won't drop below freezing, then this bag will keep you warm, dry and comfortable wherever you are.  

Its thoughtful design and rugged construction make it perfect for Downunder adventures, whether you’re heading to the top-end or down-south. The 600+ Loft Down construction of the sleeping bag will ensure you the comfort and quality of sleep that you enjoy at home no matter where you are. 

The bag is lightweight, durable, water-resistant and has loads of internal room because of its “mummy shape” design; meaning you’ll have a little extra wiggle room in the shoulders to move around. All Sea to Summit Down Sleeping Bags use Responsible Down Standard (RDS) certified down, which means no animals were harmed in the production of their bags. 

Comfort: The temperature at which a standard woman can expect to sleep comfortably in a relaxed position. If you are female or consider yourself a cold sleeper, use this rating to decide the coldest temperature the sleeping bag is suitable for. We emphasise the Comfort temperature for our women’s specific sleeping bags. 
Lower Limit: The temperature at which a standard man can sleep for eight hours in a curled position without waking. If you consider yourself a warm sleeper, use this rating to decide the coldest temperature the sleeping bag is suitable for. We emphasise the Lower Limit temperature for all our unisex sleeping bags. 
Extreme: This is a survival only rating for a standard woman. Between the lower limit and the extreme rating, a strong sensation of cold must be expected, and there is a risk of health damage due to hypothermia. This is an extreme survival rating only; we do not recommend you rely on this rating for normal use. 


  • Internal cord tunnel in the hood and neck draft tube 
  • Exterior finish is kept neat and free of additional loose fabric 
  • Internal chest pockets to keep valuables 
  • Supplied with a stuff sack for storage 
  • Zip coupling: this bag is designed to be paired with another 
  • 2-way YKK #5 side zip with anti-snag fabric provides easy access and ventilation for warm weather 

Temperature Limits 

Comfort Limit 2C
Lower Limit -3C
Extreme Limit -19C



Shell: 100% Polyester
Lining: 100% Polyester
Primary Filling: 600 + RDS Certified Duck Down (min 75%) 
Stuff sack: Polyester (excluding trims)

Dimensions + Specifications  

Recommended user height:  Regular: 20 x 32cm  Long 21 x 34cm  
Packed Dimensions:  Regular: 20 x 32cm   Long 21 x 34cm  
Volume Compressed   Regular: 5.4 L  Long 6.1 L  
Weight  Regular: 970G  Long: 1120 
Fill Weight  Regular: 400G  Long: 450G 
Internal Chest Circumference   Regular: 155cm  Long: 164.5cm  
Internal Hip Circumference  Regular:136cm   Long: 143cm  
Internal Foot Circumference   Regular 103cm   Long 107cm 

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