£583.99

This is the usual price. Wait for it to drop, or tell us your number.

£584 today · usual range £550–£584 · best ever £550

Sea to Summit Spark Pro -9C Ultralight Down Sleeping Bag

Amazon

Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 39 days · 39 data points (no recent data)

Historical
Generating forecast…
£584.49 £546.54 £554.82 £563.10 £571.38 £579.66 £587.94 18 July 2026 27 July 2026 06 August 2026 15 August 2026 25 August 2026
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Grey, ASL041071-210106

Price data last checked 52 day(s) ago - refreshing...

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Price Distribution

Price distribution over 39 days • 4 price levels

Days at Price
Current Price
4 days 23 days 7 days 5 days · current 0 6 12 17 23 £550 £551 £583 £584 Days at Price

Price Analysis

Most common price: £551 (23 days, 59.0%)

Price range: £550 - £584

Price levels: 4 different prices over 39 days

Description

The Sea to Summit Spark Pro is a technical, ultralight down sleeping bag designed for maximum warmth with minimal weight. Engineered for backpacking, bike packing, and touring, this mummy-style bag uses 950+ fill power goose down to provide exceptional insulation in a compact, compressed size. The high-loft down is Responsible Down Standard certified and treated with a proprietary non-PFC Ultra-Dry Down treatment to maintain performance and loft even in rugged, moist conditions. Designed for comfort during 3-season adventures, the contoured mummy shape allows for a natural sleeping position. A featherweight 10D nylon shell with a PFC-free DWR finish protects the hood and footbox from moisture, while the highly breathable 10D nylon liner ensures comfort throughout the night. The Free Flow Zip System features a YKK #5 side zipper to help manage temperature and airflow while you sleep.

Key Features

Professional grade 15-degree Fahrenheit (-9-degree Celsius) insulation makes this an ideal 3-season bag for backpacking and touring.

High-loft 950+ fill power goose down is Responsible Down Standard certified for premium warmth and sustainability.

Proprietary Ultra-Dry Down treatment improves moisture reaction to help the insulation retain loft and performance in rugged conditions.

The contoured mummy shape includes a hood and zipper draft tubes to keep cold air out and warmth trapped inside.

A featherweight 10D nylon shell with a PFC-free durable water repellent finish provides water resistance to the hood and footbox.

The Free Flow Zip System utilizes a YKK #5 side zipper to enhance comfort and temperature regulation.

Product Specifications

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