Sea to Summit Trek TkII 18 Sleeping Bag
With a tapered rectangular shape that offers more room than a mummy bag, the Sea to Summit Trek TkII sleeping bag keeps you warm via water-resistant, RDS-certified 650-fill-power down.
- Water-repellent, 650-fill-power Ultra-Dry Down™ retains 60% more loft and absorbs 30% less moisture than untreated down; down is also PFC-free and RDS-certified
- Responsible Down Standard (RDS) ensures the down does not come from animals that have been subject to any unnecessary harm, such as force-feeding or live-plucking
- Tapered rectangular shape offers more space than a traditional mummy bag while maintaining thermal efficiency
- Nylon shell fabric is treated with a durable water repellent (DWR) finish that sheds moisture and helps block wind
- Vertical chest baffles prevent down migration and 3D sidewall baffle maximizes loft right to the edge of the bag to prevent cold spots
- 2-way #5 YKK® side and foot zippers let you ventilate as needed; oversized zip draft tube keeps out the drafts, while antisnag materials make for smooth zipping
- 3D hood draws in tight to keep you cozy; neck collar draft tube seals in warmth
- 20-denier lining fabric is lightweight and soft on your skin
- Internal security pocket keeps nighttime essentials close at hand
- Comes with an Ultra-Sil™ compression sack and a nylon storage sack
- This bag is designed to zip together with another to create a double bag
Imported.View all Sea to Summit Men's Sleeping Bags
Tested Lower Limit
18 degrees (F) - EN
30 degrees (F) - EN
Temperature Rating (F)
18 degrees (F)
Temperature Rating (C)
-7.8 degrees (C)
Long: 2 lbs. 6 oz.
Regular: 2 lbs. 2 oz.
650-fill-power Ultra-Dry down
Long: 1 lb. 4 oz.
Regular: 1 lb. 2 oz.
Sleeping Bag Shape
Fits Up To (in.)
Long: 76 inches
Regular: 72 inches
Shoulder Girth (in.)
Long: 64 inches
Regular: 60 inches
Hip Girth (in.)
Long: 62 inches
Regular: 57 inches
Stuff Sack Size
Stuff Sack Volume
Long: 14 liters
Regular: 10 liters
Long: 7.3 liters
Regular: 6.1 liters
Down certified to the Responsible Down Standard (RDS)
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