Sea to Summit - Spark Ultralight Sleeping Bag

I camped for a week in western & northern Iceland using 7C bag, down jacket & tarp. Not a problem!!

\> Sea to summit spark 15 (EN rated -1.6°C). On sale now. Won't it be too tight? I have tried both a regular Spark 15 in the store, and a Spark Pro 15 (both in Long versions, as I'm 194 cm tall), and they are surprisingly roomy. I am a big guy at 116 kg, and I can roll onto my side inside the bag and throw my legs around. For comparison, I have tried getting into a Nordisk Passion Five XL bag too, and it wouldn't even close around my shoulders. I went with the Spark Pro 15 for the better down (so an extra degree of warmth) and additional features, but could as well been happy with the regular one. Already tested the bag out camping, and those features came in handy from flexibility standpoint - it was toasty with only 12C outside, so I opened it into a quilt and was very comfy all night. I'll be going to the Carpathians next week to sleep at 1500-1700 masl elevations and I think 3-7C degree temps, so I can share my experience afterwards, if you'll still be interested by then.

Really no way of knowing if it will fit. For me at 194 cm tall, the 198 cm Long versions of Sparks fit just enough to fit a "regular" sized aeros pillow inside the hood. If you put your pillow outside, you're probably gonna be alright with a regular length.

\> Sea to summit spark 15 (EN rated -1.6°C). On sale now. Won't it be too tight? I have tried both a regular Spark 15 in the store, and a Spark Pro 15 (both in Long versions, as I'm 194 cm tall), and they are surprisingly roomy. I am a big guy at 116 kg, and I can roll onto my side inside the bag and throw my legs around. For comparison, I have tried getting into a Nordisk Passion Five XL bag too, and it wouldn't even close around my shoulders. I went with the Spark Pro 15 for the better down (so an extra degree of warmth) and additional features, but could as well been happy with the regular one. Already tested the bag out camping, and those features came in handy from flexibility standpoint - it was toasty with only 12C outside, so I opened it into a quilt and was very comfy all night. I'll be going to the Carpathians next week to sleep at 1500-1700 masl elevations and I think 3-7C degree temps, so I can share my experience afterwards, if you'll still be interested by then.

I haven't yet used them for the ventilation per se - I've just opened up the bag completely and turned it into a blanket. I guess it's kinda tedious to zip it all up in the dark once you open them all all the way, since you'd neet to put in the ends of all 3 zippers. The main zipper on both regular and pro Sparks is a piece of art - it's a №5 zipper for starters, so less biting to start with, then the slider is a weirdly flat looking non-biting one, and there is a semi rigid plank along the whole zipper. I haven't managed to make it bite into the fabric yet - not while testing and the one night out that I had with it. The additional zippers are regular #3, but they won't see as much use, so it's fine. As for the rating, Sea to Summit lists ISO Comfort for regular Spark 15 as -2C, and for the Spark Pro 15 as -3C (https://seatosummit.eu/products/spark-pro-down-sleeping-bag?srsltid=AfmBOopnuqGUSijF2ScQljEVj7z6zcynkJ1nxRCZnEX40v0atLc9kIrm#product-techspecs)

I have the spark, comfort -1 and -9 women’s specific, I love it, it’s tiny and lightweight silky soft and as a cold sleeper it lives up to its -1 rating.  Biggest worry is that the toe box and head are water resistant but the main body of the bag isn’t, though I’ve not had any wet feathers from condensation, the main body does bead, if you get a lot of  it in your tent I’d worry about it. I generally air my tent for a while whilst getting breakfast and coffee etc.. and dry it off with a micro towel, but if you are a quick starter in the morning I can see stuffing the bag into its sack wet being a problem.  Also you can see the feathers through the yellow sections of the bag, which some people may find grim.  The zip on it is great, and I would definitely recommend.  Owned the -9 for 6months and the -1 for two so not a long term review 

I have the spark, comfort -1 and -9 women’s specific, I love it, it’s tiny and lightweight silky soft and as a cold sleeper it lives up to its -1 rating.  Biggest worry is that the toe box and head are water resistant but the main body of the bag isn’t, though I’ve not had any wet feathers from condensation, the main body does bead, if you get a lot of  it in your tent I’d worry about it. I generally air my tent for a while whilst getting breakfast and coffee etc.. and dry it off with a micro towel, but if you are a quick starter in the morning I can see stuffing the bag into its sack wet being a problem.  Also you can see the feathers through the yellow sections of the bag, which some people may find grim.  The zip on it is great, and I would definitely recommend.  Owned the -9 for 6months and the -1 for two so not a long term review 

Sea to Summit Spark, or therm a rest Hyperion. Both just a bit bigger then a nalgene bottle when it is packed down