Sea to Summit Spark Sleeping Bag
Features & how to pack away
Details & Specs
For colder conditions, where you need warmth without excess bulk and weight, the Spark Sp4 Sleeping Bag from Sea to Summit ticks all those boxes and more.
This bag has an expedition mummy bag shape which traps warmth, provides extra space, and also allows for extra layers of clothing. The Spark Sp4 has a comfort temperature rating of -8°C and a lower limit of -15°C so it can be used for expeditions in wintry conditions or climates. This bag has an ultra-light 10D nylon shell and 7D lining which keeps the weight to a minimum. To stop heat loss, the bag has a front neck draft collar and a zipper draft tube and access is easy via the full side zip which also allows you to ventilate if necessary.
For insulation, it’s filled with RDS certified 850 Loft Premium Goose down which has an ULTRA-DRY water-repellent treatment to protect it from moisture. The full box baffle construction helps reduce cold spots and accommodates the extra down in this bag. This sleeping bag also has vertical baffles on the chest to stop the down moving around, and full box baffle construction to reduce cold spots.
For maximum warmth when you’re counting every single gram, the Sp4 Sleeping Bag from Sea to Summit is the ultimate sleeping solution.
-8°C comfort rating, -15°C lower limit
Expedition mummy shape for extra wiggle room
RDS certified 850+ Loft premium goose down
ULTRA-DRY down water-repellent treatment protects from moisture
Light gauge #3 YKK zip
Full side zip with two sliders provides access and ventilation
Vertical baffles on chest prevent down moving during use
Zipper draft tube, hood and front neck draft collar
I was looking at buying this sleeping bag and wanted a dry bag compression sack (from sea to summit) to go with it. What size would work with this bag?
Sonya - Townsville (3 years ago)
The Spark SP4 Sleeping Bag is supplied with a Small Ultra-sil compression stuff sack, so if you're wanting to keep your bag watertight, then the Small Compression Dry Sack will do the trick.
Leece - Snowys(3 years ago)
How moisture resistant is the 10 denier outer shell to guard against condensation & dew in a tent?1 answer
Is it advisable to treat the outer with DWR or similar without compromising breath ability of your bag
Trevor - Kinross WA(4 years ago)
I've just had a chat with one of my colleagues who has the women's version of the bag. She reported she's experienced a little bit of condensation, but not much, and she'll just loft it out as soon as she sets up camp the next night and if there is any dampness it soon dissipates. We wouldn't recommend treating the outer shell with DWR.
Leece - Snowys(4 years ago)
Does the sleeping bag fully unzip?1 answer
Does this sleeping bag fully unzip into a quilt? And also does it have a foot zip?
Jason - Oxley (5 years ago)
Thanks for your enquiry. The Spark SP4 does not come with a foot zip and cannot unzip to create a quilt, I'm sorry to say. Check out the Trek Tk3 and the Explore Ex3 as these bags do offer these features and have similar comfort ratings and fill material.
Gen - Snowys(5 years ago)
Correct dimensions?1 answer
Are the packed dimensions really this?
Packed Dimensions: 44L x 48W x 20H cm
Doug - Eastwood(5 years ago)
At the moment we're getting all this info from Sea to Summit and as we don't actually have the bags yet I can't double check it for you. If it helps at all they're also telling us it comes packed in a 'Small' Ultrasil Compression Sack which measures 40cm x 18cm x 18cm and has a compression range of between 10L and 3.3L. Hopefully this is enough info for you to go on until we can physically confirm for you.