Sea to Summit Trek Down Sleeping Bag for Camping and Travel
Sea to Summit Trek Down Sleeping Bag for Camping and Travel
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The Sea to Summit Trek Down Sleeping Bag is a tapered-rectangular, duck-down sleeping bag built for campers and travelers who want a roomy fit, reliable warmth, and flexible ventilation in a single bag. RDS-certified 650+ fillpower duck down with a non-PFAS Ultra-Dry Down treatment provides insulation that resists moisture and dries quickly. The Trek is available in three temperature ratings (30°F, 15°F, and 0°F) and two sizes, Regular and Long, covering a wide range of conditions and sleepers.
Warmth That Holds Up in Damp Conditions
The Trek's 650+ fillpower duck down carries RDS certification, meaning the down is independently tracked from source to finished product against animal welfare requirements. The non-PFAS Ultra-Dry Down treatment makes the down hydrophobic: it absorbs less moisture and dries faster than untreated down, and the treatment survives at least 20 washings without degrading. The recycled 20D polyester shell adds a non-PFAS DWR finish that sheds light moisture from tent-wall condensation or a damp ground cloth before it reaches the insulation.
A Zip System That Adapts to the Temperature
The Free-Flow Zip system uses a full-length YKK #3 side zip with two sliders and a separate YKK #5 foot-opening zip. Opening the side zip partway vents heat from the torso; opening it fully, combined with the foot zip, lets the bag lie flat as a quilt. Snaps at the shoulders let a sleeper secure the open bag around their upper body and move around camp without losing it. That range of configurations, from fully closed on a cold night to open-quilt on a warm one, means the Trek can serve across a broader temperature window than a bag with a single fixed opening.
Fit Designed for Comfort, Not Speed
The tapered-rectangular cut gives shoulders, hips, and feet noticeably more room than a mummy bag, which matters on multi-night trips where a cramped bag becomes fatiguing. The hood is sized to accept a Sea to Summit Aeros Pillow (sold separately). Zipper coupling is supported: the unisex Trek zips to the Women's Trek and to most other Sea to Summit Women's bags, making it practical for couples who share a tent.
Features
- RDS-Certified 650+ Fillpower Duck Down: independently certified to the Responsible Down Standard with non-PFAS Ultra-Dry Down hydrophobic treatment, rated for at least 20 wash cycles
- Recycled 20D Polyester Shell: non-PFAS DWR finish resists wind and surface moisture; 100% polyester lining
- Free-Flow Zip System: full-length YKK #3 side zip with two sliders plus YKK #5 foot-opening zip; opens flat as a quilt
- Zipper Coupling: unisex Trek zips to the Women's Trek and most Sea to Summit Women's bags
- Tapered-Rectangular Fit: spacious cut for camping and travel comfort; hood accommodates an Aeros Pillow (sold separately)
- Includes Stuff Sack: 100% nylon stuff sack (excluding trims) included
Specifications
| Variant | Weight | Packed Weight | Bag Dimensions | Packed Size | Compressed Volume | Bag Length | Recommended User Height | Fill Weight | ISO Lower Limit | ISO Comfort (Women's) |
|---|---|---|---|---|---|---|---|---|---|---|
| 30°F / Regular | 1119 g / 39.5 oz | 1197 g / 42.2 oz | 196 x 79 cm / 77.2 x 31.1 in | 41 x 22.5 x 15.5 cm / 16.1 x 8.9 x 6.1 in | 8.2 L | 196 cm / 77.2 in | Up to 183 cm / 6 ft 0 in | 380 g / 13.4 oz | -1°C / 30°F | 3°C / 37°F |
| 30°F / Long | 1253 g / 44.2 oz | 1331 g / 46.9 oz | 211 x 84 cm / 83.1 x 33.1 in | 41 x 22.5 x 15.5 cm / 16.1 x 8.9 x 6.1 in | 8.8 L | 211 cm / 83.1 in | Up to 198 cm / 6 ft 6 in | 437 g / 15.4 oz | -1°C / 30°F | 3°C / 37°F |
| 15°F / Regular | 1436 g / 50.7 oz | 1531 g / 54.0 oz | 196 x 79 cm / 77.2 x 31.1 in | 46 x 27.5 x 18 cm / 18.1 x 10.8 x 7.1 in | 10.6 L | 196 cm / 77.2 in | Up to 183 cm / 6 ft 0 in | 635 g / 22.4 oz | -9°C / 16°F | -3°C / 27°F |
| 15°F / Long | 1611 g / 56.8 oz | 1706 g / 60.2 oz | 211 x 84 cm / 83.1 x 33.1 in | 46 x 27.5 x 18 cm / 18.1 x 10.8 x 7.1 in | 12.2 L | 211 cm / 83.1 in | Up to 198 cm / 6 ft 6 in | 735 g / 25.9 oz | -9°C / 16°F | -3°C / 27°F |
| 0°F / Regular | 1895 g / 66.8 oz | 1998 g / 70.5 oz | 196 x 79 cm / 77.2 x 31.1 in | 50 x 30 x 20 cm / 19.7 x 11.8 x 7.9 in | 14.2 L | 196 cm / 77.2 in | Up to 183 cm / 6 ft 0 in | 1000 g / 35.3 oz | -18°C / 0°F | -11°C / 12°F |
| 0°F / Long | 2098 g / 74.0 oz | 2201 g / 77.6 oz | 211 x 84 cm / 83.1 x 33.1 in | 50 x 30 x 20 cm / 19.7 x 11.8 x 7.9 in | 15.9 L | 211 cm / 83.1 in | Up to 198 cm / 6 ft 6 in | 1163 g / 41.0 oz | -18°C / 0°F | -11°C / 12°F |
Shell: recycled 20D 100% polyester with non-PFAS DWR finish. Lining: 100% polyester. Down fill: 80/20 duck down. Stuff sack: 100% nylon (excluding trims). ISO Lower Limit ratings apply to unisex bags; ISO Comfort ratings reflect the women's threshold and are listed for reference.
Who This Is For and Isn't
The Trek Down Sleeping Bag suits car campers, overlanders, and travelers who prioritize interior room and temperature versatility over a close mummy fit. The three temperature ratings (30°F, 15°F, and 0°F) make it a practical choice across three-season and cold-weather camping, and the zipper coupling feature works well for couples sharing a tent.
The Trek is not designed for technical backcountry or ultralight-focused trips where a close-cut mummy bag is preferred; Sea to Summit's Ascent line covers that use case. The Aeros Pillow shown in the hood is sold separately and is not included. The Long size accommodates users up to 198 cm (6 ft 6 in); taller users are outside the stated fitment range.
Common Questions
How does the Free-Flow Zip system work on the Trek Down Sleeping Bag?
The Trek Down Sleeping Bag uses a full-length YKK #3 side zip with two sliders and a separate YKK #5 foot-opening zip. The side zip can be opened partway for torso ventilation or fully to let the bag lie flat as a quilt. Shoulder snaps let a sleeper secure the open bag around their upper body and move around camp without it falling away.
What ISO temperature ratings does the Trek use, and how should I read them?
Sea to Summit rates the Trek Down Sleeping Bag using the ISO 23537 protocol, which produces two figures: an ISO Lower Limit (the lowest temperature at which a man should stay warm) and an ISO Comfort rating (the lowest temperature at which a woman should stay warm). Unisex bags like the Trek are listed by their Lower Limit: 30°F, 15°F, or 0°F depending on the variant. The ISO Comfort figures for each variant appear in the specifications table above.
How does the non-PFAS Ultra-Dry Down treatment affect the insulation?
The Ultra-Dry Down treatment on the Trek Down Sleeping Bag is a hydrophobic finish applied to the duck down itself. It causes the down to absorb less moisture and dry faster than untreated down when the bag is exposed to condensation or humidity. The treatment does not affect breathability or down lifespan and is rated to last through at least 20 washings.
What is the difference between the Trek and the Ascent sleeping bag?
The Trek Down Sleeping Bag has a broader, tapered-rectangular cut and is designed for camping, travel, and occasional backpacking where interior room and ventilation flexibility matter. The Ascent is a more technical bag built for ambitious backcountry use where a closer mummy fit and lower packed weight take priority.
Can two Trek Down Sleeping Bags be zipped together?
Yes. The unisex Trek Down Sleeping Bag supports zipper coupling and will zip to the Women's Trek as well as most other Sea to Summit Women's sleeping bags. Both bags must be present to couple them; no additional adapter is required beyond the bags' own zippers.
What is included with the Trek Down Sleeping Bag?
The Trek Down Sleeping Bag ships with a 100% nylon stuff sack (excluding trims). The Aeros Pillow shown in product images fitting into the hood is a separate Sea to Summit product and is not included.
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