Sea to Summit official product photography (Spark Down Sleeping Bag)
Sea to Summit
Ultralight down bag. The 45 F Regular lists 12.8 oz / 363 g, a 2 L compressed volume, and $349.
Sea to Summit lists the 45 F Regular at 12.8 oz / 363 g, packed 9 x 5 x 4 in, with RDS 850+ fill goose down.
$349 to $999 Price checked Oct 13, 2026
seatosummit.com listed the 45 F Regular at $349 and other ratings up to $999 when checked. Some colder ratings were unavailable. Source: Sea to Summit Spark Down Sleeping Bag. Checked Oct 13, 2026. Confirm the price before you buy.
Sleep systems
The Spark is the bag for a night outside when the pack is already full. Sea to Summit fills it with RDS-certified 850+ fillpower goose down and a non-PFAS Ultra-Dry Down treatment, in a 10D shell.
On the 45 F Regular, the same page lists 12.8 oz / 363 g, a packed size of 9 x 5 x 4 in, and a 2 L compressed volume. The price on that rating is $349. Colder ratings go higher, up to $999.
Shortlist reason: a printed ounce weight, a packed size, and a temperature rating on the maker page.
| 45 F Regular weight | 12.8 oz / 363 g seatosummit.com |
|---|---|
| 45 F Regular packed size | 9 x 5 x 4 in seatosummit.com |
| 45 F Regular compressed volume | 2 L seatosummit.com |
| Fill | RDS-certified 850+ fillpower goose down seatosummit.com |
| Shell and lining | 10D nylon shell and 10 denier liner seatosummit.com |
| 45 F Regular ISO lower | 45 F / 7 C seatosummit.com |
Feathered Friends
Feathered Friends lists 20 F, 30 F, and 40 F options with 950+ goose down.
$499 to $579 Price checked Oct 13, 2026
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Feathered Friends
Feathered Friends rates the Ibis Light at 0 F and lists 900+ goose down.
$859 to $889 Price checked Oct 13, 2026
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Feathered Friends
Feathered Friends lists a two-person bag with a Dyneema floor and 950+ goose down.
$1029 to $1059 Price checked Oct 13, 2026
View product