Disco 30

I have the Nemo disco 15. It is very comfortable. I wouldn’t use it on a warm summer night, but it is fantastic during the shoulder seasons, even if it’s not below freezing. It packs very small. The only negative is I purchased the regular size and I am exactly 6 foot. It’s a bit tight on me as a result. If you were 5’ 10” and under, I think you’d be quite comfortable.

If you sleep cold or don’t mind opening it up and using it as a blanket when the weather is too hot then maybe the 15, As others have stated, the 15 might be hot so the 30 is probably fine for that time of year. Note I bought the 15 because I go when temps are often 28-36° at night. I looked up the weather. “In August, the Pemi Loop features warm, humid days (70s-90s°F) in the valleys and cooler, windy conditions (60s-70s°F) on the ridges, with a high risk of afternoon thunderstorms and fog. Hikers must pack for rapid changes, prepare for heavy rain, and start early to avoid exposed ridge lines during storms.”

I don't have the 15, so I can't directly compare, but yeah I have no trouble getting the 30 into an 8L bag. There's not much room leftover, but it fits. I also have a Riff 30 and it fits as well.

The Tempo is a larger bag than the Disco or Riff. According the specs at REI, it weighs almost a full pound more and has a compressed volume of over 8L. I'm not a guy that can ever get anything packed away nicely or back in the box it came in, but even I had no trouble just cramming either the Riff or Disco into the 8L compression sack. They're currently on sale at REI thru next week.... 😈

I have the Nemo Riff 30, which is a little step up from the Disco with higher FP down so it's a little lighter and packs down a little smaller, but is otherwise very similar. The Riff/Disco are some of the only very lightweight backpacking bags that aren't mummy shaped. I think you'll like them. Also I personally went with the 30 since the vast majority of my camping is in the summer with warm weather. I'd die in a 15 degree bag on a 65 degree night. You can always add a sleeping bag liner on those rare nights where it's too chilly.

Nemo Disco 15 or 30...the most comfortable and weather adjustable sleeping bag in my opinion.

I love my Nemo Disco 30. I get too claustrophobic in mummy bags, but the Disco is perfect for me. It has enough room to move around a bit, I can even side sleep if I want. The extra space is worth the little bit of extra weight imo

you will ROAST in the 15 for most nights being 60-70. You could do the 30 and then get a liner for the colder nights.

honestly I think you'll be ok. I have a Disco 15, I took it on an overnight backpacking trip last May (in the Finger Lakes region of NY) to test it out; it went into the 30s overnight. I was roasting in my underwear. I've since picked up a Disco 30 (found it barely used on FB marketplace) which I think will be more appropriate (and it's smaller/lighter)! I have an Enlightened Equipment quilt too but I can't manage with that during shoulder season. I also have a sleeping bag liner so I can modify bag warmth that way. This year I was going to really dial my sleep system by temperature but then I tore my stupid ACL skiing. Maybe I'll get to do some canoe camping at least.