Compact, lightweight and technical - the Spark Sp2 Sleeping Bag from Sea to Summit is ideal for trekking in spring conditions, cycle touring or adventure racing.
Featuring a contoured mummy design with extra room for your shoulders and hips without compromising on thermal efficiency, the Spark also has a 10D nylon shell and 7D lining to keep the weight to a minimum. For insulation, it’s filled with RDS certified 850 Loft Premium
With a 4°C comfort rating and -2°C lower limit this bag is ideal for mild spring and autumn expeditions. The vertical chest baffles prevent the down moving around, the horizontal sewn through baffle construction keeps the weight down, and the draft tube prevents heat from escaping through the zipper.
For fast and light adventures, the Spark Sp2 will keep you comfortable while your sleep without having to compromise on space and weight.
Hi there, I'm looking at a new sleeping set up for hiking in Tassie and most likely NZ probably not winter. Wanting something to cover most bases and looking at this bag or the Tk1 combined with etherlite xt extreme mat. Is there much else to consider apart from cost and weight when comparing these two, or should I look at warmer bags? And will a liner help boost the comfort rating?
G'day Evan,
This is a massive topic to delve into as there are so many factors to consider. I would strongly encourage you to listen to our Sleep System Rating podcast with Sea to Summit, as it basically has all the information you need to decide what gear is right for you.
You can check it out here.
Basically, start with your sleeping mat, and choose one with an R-Value of 4 or more. Your mat doesn't generate heat or keep you warm, it only acts as an insulative barrier between you and the ground. If your sleeping bag comfort rating isnt appropriately matched to the ambient temperature conditions, a higher R-Value mat isn't going to make up the deficit.
From there you can look at your sleeping bag option, but the things to consider depends on if you are a hot or cold sleeper.
The bags you have mentioned are essentially warmer-season bags. Eg. the TK1 and Sp2 will probably cover you in ambient temps of 6-10 degrees. You should choose a comfort rating that will 100% cover you for all situations, and aim for 5 degrees lower than coldest temp if you are a standard sleeper, or 10 degrees lower than coldest temp if you are a cold sleeper.
If you don't have the right mat and bag combo, a liner won't help you too much, so have a listen to the podcast, nail your mat and bag combo, and go from there.
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