The Sea to Summit Treeline 1 sleeping bag is your straightforward and dependable companion for uncomplicated summer adventures. This budget-friendly down sleeping bag is designed for three-season use, providing warmth and comfort for outdoor enthusiasts who expect temperatures to stay above freezing.


  • Internal Chest Pocket: The sleeping bag features an internal chest pocket, perfect for securely storing valuables or keeping batteries warm during the night.
  • Supplied with Storage Accessories: The Treeline comes with a stuff sack for convenient and compact storage. It also includes a storage cell to ensure that your sleeping bag remains in great condition between trips.
  • Zip Coupling: This sleeping bag is designed to pair with another, making it a versatile choice for those who want a double sleeping bag option.
  • RDS 600+ Down: The Treeline is filled with super-compressible and lofty Responsible Down Standard (RDS) 600+ down, ensuring excellent insulation and warmth.
  • Durable Shell and Lining: The sleeping bag's 50D Nylon shell and lining fabric provide durability without compromising compressibility, making it suitable for outdoor use.
  • Draft Tube: A draft tube is included to prevent heat loss through the zipper, helping to keep you warm during colder nights.
  • Internal Draw Cords: The hood and neck draft are equipped with internal draw cords, allowing you to adjust the fit and keep warmth inside.
  • Two-Way YKK® Zipper: The sleeping bag features a two-way YKK® #5 side zip with an anti-snag system, making it easy to access and providing ventilation options for your comfort.


  • SIZE: Regular
  • BAG SERIES: Treeline 1
  • BAG WEIGHT: 970g
  • FILL WEIGHT: 400g
  • FITS UP TO HEIGHT: 183 cm
  • SEASON RATING: 3 Season

The Sea to Summit Treeline 1 sleeping bag offers an affordable and practical solution for outdoor enthusiasts who want reliable performance during three-season adventures. With its durable construction, budget-friendly price, and a range of features, it's an excellent choice for camping, hiking, and backpacking.


Model # ATL1-R
Barcode # 9327868095421
Brand Sea to Summit

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