Sea to Summit Spark SPII 28 Review
Cons: Terrible zipper, uncomfortably narrow, difficult to compress, noisy fabric
Manufacturer: Sea to Summit
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Sea to Summit Spark SPII 28
|Price||$379 List||$485 List||$429.00 at Feathered Friends||$389.00 at Feathered Friends||$349.95 at Backcountry|
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|Pros||Ultralight, high-quality goose down, packs down extremely small||Spacious dimensions, super comfortable, great loft, lightweight, made in the USA||Super lightweight, incredible loft, snag-proof zipper, cozy hood||Best-in-class zipper, best-in-class hood, awesome loft, great warmth-to-weight ratio||Spacious hourglass shape, innovative venting "gills", waterproof footbox, sturdy compression sack|
|Cons||Terrible zipper, uncomfortably narrow, difficult to compress, noisy fabric||Expensive, awkward hood, good but not great zipper||Uncomfortably narrow dimensions, bare-bones design, noisy fabric||Narrow leg dimensions, no draft collar, heavier and bulkier than some 3-season options||Below average warmth-to-weight ratio, bulky packed size|
|Bottom Line||A long list of problems unfortunately compromise this ultralight bag||If we could only have one bag for the rest of our lives, this would be it||The ideal bag when you need the warmth, but ounces matter too||Exceptional warm and loft along with our favorite hood and zipper||An hourglass bag with premium down and spacious lower dimensions|
|Rating Categories||Sea to Summit Spark SPII 28||MegaLite||Hummingbird UL 30||Swallow 20 YF||NEMO Riff 30|
|Packed Size (15%)|
|Features & Design (10%)|
|Specs||Sea to Summit...||MegaLite||Hummingbird UL 30||Swallow 20 YF||NEMO Riff 30|
|Insulation||850+ FP Down||850+ FP Down||950+ FP Down||900+ FP Down||800 FP Down|
|Compressed Volume (L)||6.6 L||7.2 L||7.3 L||8.5 L||7.2 L|
|Measured Bag Weight (Size Long)||1.21 lbs||1.62 lbs||1.45 lbs||1.94 lbs||1.91 lbs|
|Manufacturer claimed weight of size Regular (lbs)||1.1 lbs||1.5 lbs||1.33 lbs||1.79 lbs||1.8 lbs|
|Compression/Stuff Sack Weight (oz)||1.2 oz||1.6 oz||0.8 oz||1.0 oz||2.4 oz|
|Manufacturer Temp Rating (F)||28 F||30 F||30 F||20 F||30 F|
|EN Temp Rating (Lower Limit, F)||28 F||Not rated||Not rated||Not rated||29 F|
|Fill Weight (oz)||12 oz||13 oz||12 oz||17.5 oz||10.2 oz|
|Compression or stuff sack included?||Compression||Stuff||Stuff||Stuff||Compression|
|Shell material||Ripstop nylon (10D)||Extremelite (12D)||Pertex Endurance (10D)||Pertex YFuse (20D)||Ripstop nylon (20D)|
|Liner material||Nylon||n/a||n/a||Pertex 20 denier nylon taffeta||30D nylon taffeta w/ DWR|
|Small Organization Pocket||No||No||No||No||Yes|
|Zipper||1/2-length / Side||Full-length / Side||Full-length / Side||Full-length / Side||3/4-length / Side|
|Shoulder Girth (in)||59||64||58||60||62|
|Hip Girth (in)||51||Not stated||52||56||54|
|Foot Girth (in)||Not stated||39||38||38||59|
Our Analysis and Test Results
The Spark II is stuffed with 12 ounces of 850+ fill power goose down. This is a whole lot of down for a bag that weighs 19 ounces total. The short 1/3-length zipper limits the possibility for heat to escape. Despite these indicators, we weren't particularly impressed with this bag's warmth. It came close to living up to its 28°F temperature rating, but our testers felt warmer in several other comparable bags that chose to include a neck baffle.
Where the Spark II really shines is in the weight department. At just 1.21 pounds for a size long, it is among the lightest of the 3-season sleeping bags that we've tested. This will surely be appreciated by anyone in the ultralight crowd that prefers a full mummy hood. Considering its respectable warmth, this also means that the Spark II has an awesome warmth-to-weight ratio.
In any sleeping bag design, there will inevitably a balance of trade-offs. And with this bag, the Sea to Summit product designers seem to have traded away comfort. Our testers found its meager interior dimensions to be uncomfortably constrictive, particularly for the lower legs and feet. The fabric also has an unusual coating that makes it noisier than most bags we've tried. If comfort or roominess is paramount, we suggest selecting something with a few more inches in girth.
We were able to compress this bag down as small as any backpacking sleeping bag we tried. We learned this using the same third-party compression sack that we used in all our tests, but the Spark II comes with its own lightweight sack that's capable of full compression. We disliked this sack, however, because it is sized so small that it is difficult to cram the sleeping bag all the way inside. This difficulty is worsened because the shell fabric 's seems to trap air inside in a way that other bags didn't. Our testers were routinely frustrated, waiting for air to escape so that they could finally close this undersized sack.
If you hope to use the Spark II across a wide range of temperatures, then you should also plan to be uncomfortable. Its 1/3-length zipper hardly provides the means to vent excess heat on warm nights. At the same time, the lack of a draft collar ensures that precious heat will escape out the hood during cold conditions. Combine these two issues and prepare to sweat or shiver if overnight lows are anywhere outside the narrow range of 40 to 55°F.
Features and Design
Here at OutdoorGearLab, we are usually in full support of ultralight designs, but in the case of the Spark II it seems that just too much has been sacrificed for the sake of trimming ounces. We particularly dislike the small zipper (YKK #3) that was constantly snagging. The end of this zipper is inexplicably sewn directly into the bag, which means that if it snags badly, there is no way to back it down and get it restarted.
For an expensive sleeping bag, the Spark II also comes with a seemingly cheap drawstring. This drawstring, along with the zipper pull tab, is scratchy and prone to rubbing your face in a way that disturbed the sleep of several testers.
To get your hands on this ultralight bag, you have to lay down a hefty pile of money. This is understandable considering the premium 850+ fill power down it contains. The overall performance of the bag, however, does not live up to this price tag in our opinion. For this reason, we don't believe it's an especially good value.
It can be tempting to select a sleeping bag based on the numbers. The Spark II is warm down to 28°F and weighs just 18 ounces, where do I get one?!? In the performance areas that are harder to measure, however, such as comfort, versatility, and design, this bag simply doesn't excel. For this reason, we suggest weight-conscious shoppers consider some of the other backpacking sleeping bags that are still lightweight but don't sacrificing performance in other areas.
— Jack Cramer