You could use the spark 50 f or even the spark 40 f or 28 f to boost the performance of a bag for cold weather use.
Sea to summit spark spii 28 sleeping bag.
All sea to summit down sleeping bags use responsible down standard rds certified down.
Our testers particularly detest its narrow dimensions and a zipper that constantly snags.
Sea to summit s spark spii down sleeping bag is a true minimalist bag that uses the lightest materials and highest quality responsibly sourced down to deliver an exceptionally high warmth to weight ratio when compared to other similarly rated bags.
The highest lofting down used in any of sea to summit s sleeping bags.
There is a lot to like about the sea to summit spark spii 28 its 850 fill power goose down a total weight barely over a pound and an absolutely miniscule packed volume there is also plenty to dislike about the spark ii.
Designed to keep you as warm as possible while minimizing packed weight and size the sea to summit spark spii 28 sleeping bag is ultralight and technical for your industrious adventures.
The ultradry down protection also makes the spark an impressive hard alpine or adventure racing bag where every gram is counted and down has never been a viable option.
Spark spii 2 c zoom.
Available at rei 100 satisfaction guaranteed.
The liner has a plush feel on the skin and the down insulation gives it a comfortable feel.
The spark ii bag features vertical box baffles on the chest area to minimise movement of down optimising insulation where you need it most with.
When the sea to summit spark spii sleeping bag large size is compressed down it s not much bigger than a 1 liter 32 ounce water bottle.