The Spark Pro is Sea to Summit's premium ultralight down bag, with 900+ fillpower RDS-certified goose down treated with a non-PFAS Ultra-Dry coating. The shell and liner are 10D nylon with a non-PFAS DWR. The 30°F regular weighs 1 lb 5.8 oz with a fill weight of 10.9 oz. Packs to 5.3 liters in the included 8L compression sack. Available in Regular and Long lengths.
$549
1 retailer
At a glance6 specs
zipper
YKK #5 side, YKK #3 footbox/shoulder, free-flow system
fill power
900
fits height
Up to 6 ft 1 in (Regular) / 6 ft 6 in (Long)
liner fabric
10D nylon
shell fabric
10D nylon with non-PFAS DWR
down treatment
Non-PFAS Ultra-Dry Down (RDS-certified)
Where to buy
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Description
Last reviewed May 03, 2026
Full specifications
12 fields
| zipper | YKK #5 side, YKK #3 footbox/shoulder, free-flow system |
|---|---|
| fill power | 900 |
| fits height | Up to 6 ft 1 in (Regular) / 6 ft 6 in (Long) |
| liner fabric | 10D nylon |
| shell fabric | 10D nylon with non-PFAS DWR |
| down treatment | Non-PFAS Ultra-Dry Down (RDS-certified) |
| fill weight oz | 10.9 |
| packed volume l | 5.3 |
| comfort rating f | 37 |
| compression sack l | 8 |
| temperature rating f | 30 |
| total weight oz regular | 21.8 |
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