The lighter-weight Spark, with 850+ fillpower RDS-certified Ultra-Dry goose down, technical hood, and zipper draft tube. 10D shell with non-PFAS DWR and a 10D liner for breathability. The right bag when ounces matter but warmth still does — backpacking, bikepacking, or alpine trips where the Pro is overkill.
Sea to Summit
Spark Down Sleeping Bag
Shipping
$349
1 retailer
At a glance6 specs
fill
RDS-certified Ultra-Dry goose down
shell
10D nylon with non-PFAS DWR
use case
Backpacking, bikepacking
temp rating c
-18
temp rating f
0
fill power plus
850
Where to buy
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Description
Last reviewed May 16, 2026
Full specifications
6 fields
| fill | RDS-certified Ultra-Dry goose down |
|---|---|
| shell | 10D nylon with non-PFAS DWR |
| use case | Backpacking, bikepacking |
| temp rating c | -18 |
| temp rating f | 0 |
| fill power plus | 850 |
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