Sea to Summit

Sea to Summit Talus TS1 23 Degree 750+ Down Sleeping Bag - Long Left Zip Closeout

$369.00 $295.00
In stock
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Product description

Backpacking across Europe this summer? Road tripping down the coast? The 3-season Sea to Summit Talus TsI down sleeping bag keeps you warm in a broad range of environments and a variety of adventures.

750-fill duck down
Long - Left Zip: 2 lbs. 3 oz.
Regular - Left Zip: 1 lb. 15 oz.
Temperature Rating (F)
23 degrees (F)


  • High loft, premium 750-fill-power European duck down offers superb warmth with minimal weight; Ultra-Dry Down™ water-repellent treatment protects down from moisture
  • Ultra-Dry Down is a water-repellent polymer treatment applied to the 750-fill down; Ultra-Dry Down retains 60% more loft and absorbs 30% less moisture than untreated down
  • With a European Norm (EN) lower-limit rating of 23°F, the TsI bag will help keep you warm on 3-season backpacking adventures
  • Shell fabric is constructed of 2D NanoShell™ technology, a ripstop nylon fabric treated with a Durable Water Repellent and a non-woven silicone encapsulated fabric
  • Innovative shell technology manages condensation, moving moisture vapor through down and siliconized barried outward; shell repels water and protects the loft of the bag
  • Lining is a breathable, durable 20-denier polyester fabric with a soft touch
  • Relaxed mummy shape is cut with a large hood, broad shoulders and large chest for a more comfortable sleeping bag while maintaining thermal efficiency
  • Upper side of bag features a differential cut (inner layer is cut smaller than the outer layer to create consistent thickness of insulation) to help prevent cold spots
  • Reverse differential cut on lower side; inner layer is cut larger than the outer layer to allow down to loft up, filling spaces around body so warmth wraps around you
  • Oversize draft tube backing the zipper keeps the warmth in and the cold out; zipper is backed by stiff, antisnag tape for smooth operation
  • Full length side zipper allows bag to be joined to other Sea to Summit sleeping bags
  • Interior zipper security pocket is great for stowing small essentials, alleviating middle-of-the-night fumbling and preserving battery performance in cold weather
  • Oversize collar drapes comfortably over neck and shoulders, sealing out drafts; dual elastic adjusters
  • Preventing cold air from seeping in, offset baffle construction allows the duck down to remain fully lofted and keeps it from shifting
  • Sea to Summit Talus TsI bag comes with a Ultra-Sil® compression sack, an oversize mesh storage cell and a large cotton sack
  • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags


Many sleeping bags are rated for temperature by an independent testing protocol. With both European Norm (EN) 13537 and International Organization for Standardization (ISO) 23537 testing, each bag gets a Comfort (or T-Comfort) rating and Lower (or T-Limit) rating. The Comfort/T-Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower/T-Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a hat, sleeping on a single 1 in. thick insulating pad. Many brands use the Comfort rating for women's bags and the Lower rating for men's and unisex bags. Everyone's body and sleep comfort differ, so EN and ISO ratings are simply a guideline to help you compare products.

Technical specs

Best Use
Tested Lower Limit
23 degrees (F) - EN
Tested Comfort
34 degrees (F) - EN
Temperature Rating (F)
23 degrees (F)
Temperature Rating (C)
-5 degrees (C)
Long - Left Zip: 2 lbs. 3 oz.
Regular - Left Zip: 1 lb. 15 oz.
Ripstop nylon
Insulation Type
Water-Resistant Down
750-fill duck down
Fill Weight
Long - Left Zip: 16 ounces
Regular - Left Zip: 14 ounces
Sleeping Bag Shape
Fits Up To (in.)
Long - Left Zip: 78 inches
Regular - Left Zip: 72 inches
Shoulder Girth (in.)
Long - Left Zip: 61 inches
Regular - Left Zip: 59 inches
Hip Girth (in.)
Long - Left Zip: 57 inches
Regular - Left Zip: 54 inches
Stuff Sack Size
7.5 x 14 inches
Stuff Sack Volume
10 liters