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The Spark -1 is a slightly beefed up version of the standard Spark lightweight bag. It’s still fantastic for fleet-footed jaunts where every gram counts, but an extra 200g of insulation lets you push your adventures beyond the summer season. At just 584g for the regular size women's model, everything's designed to maximise that all-important warmth to weight ratio, from the featherlight 10 denier nylon shell fabric to the top quality 850+ fill goose down. As you'd expect from a bag this light, they've gone for a tailored mummy fit that makes the most efficient use of your natural body heat, and they've stuffed extra fill in the hood for comfort where it counts. Where standard down sleeping bags can be quite vulnerable to moisture, the goose down filling in the Spark has been specially treated to make it insulate better when wet – and dry out much more quickly – plus the vulnerable hood and footbox areas are reinforced with a breathable waterproof shell. Take that, tent condensation. This women’s version has a slightly different fit for heat efficiency, and it’s also bulked up with a bit more insulation to allow for the fact that women tend to sleep a smidge colder
| Regular | Long | |
| Weight | 584 g | 639 g |
| Fill Weight | 375 g | 430 g |
| Compressed size | 5 L | 8 L |
| Shoulder circumference | 142 cm | 152 cm |
| Hip circumference | 132 cm | 142 cm |
| Footbox circumference | 92 cm | 102 cm |
| Max user height | <170 cm | < 185 cm |
What is it that attracts us to the idea of adventure? For Sea to Summit, it’s about freedom and self-reliance – the ability not just to survive, but to thrive in any environment. But although the brand takes its gear seriously, it does so with trademark Aussie humour and blunt, no bullsh*t candour. That’s the way it’s always been, ever since founder Roland Tyson made his first outdoor gear on an old industrial sewing machine in his childhood bedroom back in 1983, at the age of 17. Soon he was designing and manufacturing equipment for other Australian adventurers – and in 1991, he outfitted an unusual first ascent of Everest, in the form of a 1,126 kilometre journey from sea level to the mountain’s 8,848-metre summit. The name Sea to Summit was born.
In 1993, Roland was joined by Penny Sanderson, another Aussie explorer and innovator. Their designs were honed on their adventures, as they spent months climbing, sailing, trekking, overlanding and biking. Nearly thirty years later, Sea to Summit is still 100% Aussie owned and operated, and still putting painstakingly designed gear into the hands of customers worldwide.
