WM Ultralite or Summerlite

This specific question has been discussed a bit before, so if you do a search you find some extra info.

If you are a warm sleeper, and don't mind sleeping in your insulated jacket when the temps drop below freezing then the Summerlite would be the way to go.

I'd certainly recommend giving the summerlite a go first, because you can always upgrade later if you find it's not warm enough for you. A summerlite will be snapped up on gear swap pretty quickly so no problems selling it on.

If you were going to be consistently sleeping at temperatures around freezing or below then the ultralite would probably be better… it has full draft collar which makes quite a difference.

As for the length, you should be able to squeeze into the 6' version. I don't think it is suitable for anyone over 5'11" but I reckon 5'11" should be pretty ok.

Cheers, A

I have a Ultralite and believe all WM bags are conservatively rated…that being said both of these bags are cut narrow w/ a 59" shoulder girth limiting additional layering.
You might consider the WM Megalite, you'll save 5oz over the Ultralite and w/ 64" girth through the shoulders, it'll allow for layering.

I'm around 6'1 and 160 pounds and have plenty of space in my ultralite (including for layering). I actually wouldn't want a bigger bag, because it then becomes a bit more drafty. Obviously depends on your body type, but sounds like you're pretty trim. I don't think the narrower cut will be a problem for you (BTW, both bags have the same cut).

Size wise they should be OK if you are not claustrophobic.. At 5'7" , 150lbs , I find the Ultralite just right for me including being able to wear a jumper or puffy jacket and inside a silk liner. ( I move around but not as much as I used to). You should be of a very similar shape.
I would say that the Summerlite , if you are a warm sleeper, could be doable but the Ultralite would be much more comfortable. To put it another way I could put up (in theory, because I have the Highlite and the Ultralite) with the Summerlite at 25f on top of the Exped 7 but provably be uncomfortable on top of the Prolite 4.
20f is no problem for the Ultralite.
BTW I have spotted another "I have had my first good night sleep with …" (thick mat) comment today. I always ask myself, for a few ounces less should anyone put up with a bad night sleep ?
Franco

Spot on Franco. I love my Ultralite + Prolite4 combo. And it's 3 season warm enough to spread out as a quilt for 2 if you and your partner are thin and friendly. :-)

You really can't go wrong with either bag. I would go with the Ultralite if in doubt of which one to get. You can always unzip it if it gets too warm. Personaly, I don't like to wear a lot of clothing inside a sleeping bag. I like for the bag to do the insulating. By the way I do have both of these bags. I'm 5'10" 200 lbs.

I am 6-0 155 and have both a Summerlite and a Ultralite (not the Super) in regular length. I tend to be a cold sleeper and find my Summerlite only suitable to the mid thirties (probably because I use my Summer pad with it (3/4 Prolite 3)) wearing capaline 1 top and bottom to keep the bag clean. I have been comfortable down to 17* in my Ultralite but I was on my Exped Downmat which makes a difference.

If you are a warm sleeper, I would recommend the Summerlite for those temps. It is an extremely light bag.

What Franco said. If you know from the get-go that you'll be pushing the temp of the Summerlite, you know you'll be comfortable in the slightly warmer bag–Ultra is the safer bet. Summerlite would probably work for many nights, but… The Ultra does also have the plush draft collar, which really helps at lower temps. Don't skimp on the pad.

I'm 6'0" and 205lbs. I have the regular length Summerlite and it fits me albeit a bit tight. I can't wear a whole lot of clothing underneath.

I'm a cold sleeper. When I've slept out (no tent), I've been cold in the 40's. When in a tent I've been comfortable to low 30's/high 20's (note: I was wearing a couple of layers at the time).

I find the bag is not good at all when exposed to a cold wind. One needs to have a good windbreak (tent, wind blocking tarp, etc.) and can't just sleep out even in the high 40's in my experience.

The Summerlite is a very cool bag. I can pack it in a Prolite 4 stuff sack. It's not that the WM stuff sack is all that heavy, but the Summerlite is that compressible.

BTW, I have a Mountain Hardware Phantom 15 (1 lbs, 15 oz), so I just take the bag that seems most appropriate for the weather, so I didn't have to agonize over the "if I'm only going to have one bag, should I go with rating 'x' vs 'y' decision. I got my Summerlite on eBay to save a few bucks and I got the Phantom 15 on a steep mark down ($100+ off).