Spark Pro Down Sleeping Bag -9C

\> 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 got sea to summit spark pro -9, its rated for -3 comfort. 860g for long. I think a non pro regular version is 730g. and its very wide, I'm able to fold my legs inside it and turn around easily. and I'm 186cm. Was cozy in it undressed at +0 outside (was +4 in tent) , and I'm a skinny cold sleeper.

Thats why I went for the pro which opens as a blanket. Expensive, but probably the only sub 900g wide sleeping bag rated for negative comfort

Yes, I used to use the Sea to Summit Spark Pro, but I found it didn’t work well for me since I’m a side sleeper — I’d often end up sliding off the pad. Quilts can be secured to the pad, which makes a big difference for someone like me. Also, I’m a 5'5" female, and most regular sleeping bags are way too long. Custom-made quilts are a much better fit.

I’m 6ft 187lbs. I’ve got room in it but I’d have more if I got the longer version. I just didn’t wanna carry the extra weight. I like the fact that the bag can almost turn into a quilt and has lots of spots for heat to escape. Edit: as in zippers if you get too hot. I sleep extremely hot so it’s nice to open the bag up on top and use it like a quilt almost

My spark pro from sea to summit you can unzip and stick your arms and feet out lol :) kind of gimmicky but I can see it being nice on cold nights It also weighs quite a bit less than the Coleman 15 degrees bag I bought before. The Coleman had higher D rating material and allowed you to strap the bag to the pad which I think is neat tho

I’ve always used mummy bags and they work great for me but it’s a matter of preference. Obviously you can’t “starfish “. I would call S2S, ask if you could buy it, try it on in your home and return if it just doesn’t work. You might also look at the Pro version, slightly more bulk and weight but a little roomier and more versatile. The folks there seem to be very knowledgeable and willing to help.

Take a real hard look at the Sea to Summit Sparc rated to 30f, also comes in a 45 and 15. Beautiful bag, stuffs to the size of a 1ltr water bottle. Fabric and down technology is,in my humble opinion, unmatched. I’ve been in the industry for many decades, owned and tested more bags than I can name. S2S bags are a well kept secret.

Sea to Summit Sparc. 30f bag that compresses to the size of a water bottle.

I have a couple of those bags, I've been in the industry for decades and S2S makes some of the nicest, tech-forward bags I've ever seen or used. Great little company, superb product and support.

Sea To Summit makes, in my opinion, the best warmth to weight/ bulk equipment on the planet. It’s not budget, but it’s not the most expensive line out there and they do occasionally have sales. Take a hard look at the Sparc line of sleeping bags.

Sea to summit Spark Pro is awesome!