Sea to Summit
Spark Pro 30
Manufacturer list price (MSRP)
$549.00
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Overview
The Sea to Summit Spark Pro is the brand's flagship ultralight down bag, built with 900+ fill power goose down and a 10D nylon shell for maximum warmth at minimum weight and pack size. The 30-degree model is a two-season backpacking bag for weight-conscious trips.
Specs
- Brand
- Sea to Summit
- Weight
- 480 g · 16.9 oz
- Temp rating
- 30°F / -1°C (manufacturer rating, not independently ISO 23537 / EN 13537 tested)
- Fill
- 900+ fill power goose down, Ultra-Dry Down (RDS certified)
- Shape
- Mummy
- Fill Material Type
- ‎Down
- Item Package Dimensions L x W x H
- ‎13.4 x 7.7 x 5.3 inches
- Materials
- PFC free shell, nylon liner
- Fill Material — Source: retailer · checked 2026-08-16
- Material Primary — Source: retailer · checked 2026-08-16
- Packed Size — Source: retailer · checked 2026-08-16
- Shape — Source: retailer · checked 2026-08-16
- Temperature Rating F — Source: retailer · checked 2026-08-16
Weight vs. category
45% lighter than the category average.
How it measures up
Against every one of the sleeping bags & quilts in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
- Weight
- 1.06 lb (480 g)
- Lighter than 71% of 24 weighed · #7 lightest
- -48% vs the median 2.04 lb
- Price
- $549.00
- Cheaper than 10% of 29 priced · #26 cheapest
- +51% vs the median $364.00 · $32.42/oz (median $8.20/oz)
- Temperature rating
- 30 °F
- Lower than 21% of 47 rated
- median 20 °F
The lightest of the sleeping bags & quilts on record is Gossamer Gear Cumulus x Gossamer Gear Aerial 330 Sleeping Bag at 11.6 oz — 151 g less and $150.00 less.
The cheapest is Sea to Summit Boab Synthetic Sleeping Bag at $124.00 — $425.00 less and 830 g heavier.
RidgeNote verdict
Similar — lighter or cheaper
Compared with
Side by side on weight, list price and cost per ounce.
Related reading
What Is the Lightest 20 Degree Sleeping Bag in 2026
See how NEMO, Kelty, and Sea to Summit 20 degree bags compare by weight, price per ounce, and rank across the current shelf for 2026.
What's the Lightest Ultralight Sleeping Bag Worth Buying in 2026?
RidgeNote ranks 24 ultralight sleeping bags and quilts by published weight, from 11.6 oz to 72.0 oz, so you know what going lighter costs in ounces.
What Is the Lightest 30 Degree Sleeping Bag in 2026?
See which 30 degree sleeping bags and quilts weigh least, ranked by grams, ounces, and price per ounce across the full shelf.
Manufacturer list price (MSRP)
$549.00