Summerlite is the lighter of the two by 80 g (2.8 oz).
Spark Pro 30
Summerlite
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Weights and prices are the manufacturer’s published figures. The lower weight and the higher R-value are highlighted.
| Spark Pro 30 Sea to Summit | Summerlite Western Mountaineering | |
|---|---|---|
| Weight | 21.8 oz | 19.0 oz |
| MSRP | — | $535.00–$570.00 |
| Temperature rating | 30°F / -1°C (manufacturer rating, not independently ISO 23537 / EN 13537 tested) | 32°F (manufacturer rating) (manufacturer claim) |
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“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.”Full specs and prices for the Spark Pro 30 →
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“The SummerLite is an ultralight summer sleeping bag designed for fast-moving backpackers, bikepackers, and thru-hikers chasing miles in warm weather. Weighing just 19 ounces, it delivers true ultralight performance without sacrificing comfort or warmth.”Full specs and prices for the Summerlite →