Source-linked specifications for the Sea to Summit Alpine Down Sleeping Bag — -20F / Long. This is a detailed sleeping bags record, checked on 2026-10-30; price and live stock are not verified.
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What the specs mean
The product name or temperature label is not automatically an ISO comfort rating. An independently comparable comfort number is not recorded for this variant. Treat a manufacturer label as a shopping description, not a safety guarantee. Fit also depends on usable internal length, shoulder room and your sleeping position. Pad insulation and weather matter as much as the bag.
Read the exact variant
-20F / Long is the recorded option. Other sizes or revisions may have different dimensions, weight, or test labels.
Reported specifications
Unit conversions are calculated from the source value. Open the source tag for the originally published number.
| Specification | Manufacturer or retailer value |
|---|---|
| Product temperature label | -20°F [BQ-STS-ALPINE] |
| Rating method | manufacturer_label_ISO_scope_unverified_below_minus20C [BQ-STS-ALPINE] |
| Fill | goose down 90/10 [BQ-STS-ALPINE] |
| Fill power | 850 [BQ-STS-ALPINE] |
| Fill weight | 2.50 lb [BQ-STS-ALPINE] |
| Shape | expedition mummy [BQ-STS-ALPINE] |
| Weight | 3.63 lb [BQ-STS-ALPINE] |
| Packed volume l | 14 L [BQ-STS-ALPINE] |
| Max user height cm | 78.0 in [BQ-STS-ALPINE] |
| Fill power qualifier | + [BQ-STS-ALPINE] |
| Shell fabric | 20D recycled nylon [BQ-STS-ALPINE] |
| Lining fabric | nylon [BQ-STS-ALPINE] |
| Water repellent treatment | non-PFAS DWR / Ultra-Dry Down [BQ-STS-ALPINE] |
| Manufacturer claimed comfort f | -2°F [BQ-STS-ALPINE] |
| Manufacturer claimed limit f | -20°F [BQ-STS-ALPINE] |
A blank or unverified value means the dataset cannot support a number; it does not mean zero. Each source tag opens the record used for that field.
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Verification limits
Evidence basis: manufacturer_declared. US market: confirmed. Listing status: listed. These labels do not establish current stock.
Unverified fields: comfort_f, lower_limit_f, temperature_standard
- Manufacturer numeric table retained; a displayed marketing temperature may differ from the tested limit.
- Extreme-cold bag: manufacturer page labels ISO, but applicable test scope/report has not been established; values retained as claims.
Where these facts came from
- Alpine Down Sleeping Bag — Sea to Summit, accessed 2026-10-30 [BQ-STS-ALPINE]
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Questions to ask before buying
Is the listed price current?
No price or live stock data is included. Use the official product link for the current listing.
Does a nominal capacity or temperature label guarantee fit or warmth?
No. Compare exact dimensions and tested values where available, then allow for real-world conditions.
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