I've borrowed this bag for testing and it's alright.
The bag is very light but that comes at the cost of durability and a fairly narrow profile.
The material is very thin and although it was fine during my multi day trip, it certainly isn't confidence inspiring. Especially since my partner is a dog which likes to sleep ontop of my bag.
I also found it to be noticeably narrow, especially around the legs.
Despite being called the Aphelion -7C, the comfort rating is -1C, which seems about right since I was starting to feel cold at around 3 or 4C.
One of the other bags I currently own is the S2S Spark Pro -9C and it's my go-to bag for shoulder season camping. It's only around 10% heavier than the Aphelion but it's much warmer, roomier and has a zipper that opens all the way to basically become a blanket. S2S occasionally has a 40% off sitewide sale. If you're in no rush, that would be a much better bag than the Aphelion.
During my last trip in Algonquin last October, the temperature dropped to around -2C and I felt comfortable. I was wearing base layers, and was using an S2S reactor liner and a Thermarest Xtherm.
My pup crawled down the bag and was nestled in between my legs so we definitely kept each other warm. But its also a testament to the roominess and durability of the bag. Haha!
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.
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.
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.
Top Outdoor Sleeping Bags on Reddit
1
NEMO
Disco 15 Series
78% positive of 120 users
Spacious for side sleepers; bulky, temp rating optimistic.
0x2012
