Sea to Summit Spark SP 850+ Loft Down Sleeping Bag. The item “Sea to Summit Spark SP 850+ Loft Down Sleeping Bag” is in sale since Friday, February 8, 2019. This item is in the category “Sporting Goods\Outdoor Sports\Camping & Hiking\Outdoor Sleeping Gear\Sleeping Bags”. The seller is “mountainbke” and is located in Elizabeth, Colorado. This item can be shipped to United States.