G'day Rod,

The Cold Mountain or Alaska Black are the warm two of the bags listed, so they may be the way to go, especially if you're not using an upgraded self inflating sleeping mat.
If you are a warm sleeper and you prefer having the option of a removable liner, the Oztent Rivergum may be the way to go.
You can always chuck an extra blanket in if needed.

G'day Rod,

There isn't a separate liner with this sleeping back, it just has flannel inner material.
If you are specifically needing a bag with a removable liner, check out the Oztent Rivergum XL as an alternative.
Hope that helps!

G'day Bruce,

Yep, the Alaska bags do have the option to cinch the hood.  The dimensions of the bag are measured when flat, so once you put a 3D body inside, it will be a bit narrower from the space taken up.
You shouldn't have any issues using this in an 1100 swag, and your height wont be much of an issue at all.

G'day Marc,

In terms of material quality they're much of a muchness but the Alaska is alot warmer, hence the heavier overall size with additional insulation, and the higher price point.
Hope that helps!

G'day Rick,

Yes, absolutely.  This bag has dual zippers - ones down either side, so they're easily joined.

G'day Carl,

Those numbers refer to the width of the sleeping bag, 90cm wide, or 110cm wide.
Which one you choose literally just comes down to personal preference, and whether on not you want a wider or narrower fit.
If you are wanting to use your bag with a swag, I'd chose the width that best corresponds to the width of that.

G'day James,

Yes, you can fully open the Alaska Black 1100 and use it as a doona.

G'day Katie,

The Alaska 1100 is a popular model to use inside the 1100 wide swag range. If you do roll the sleeping bag up inside the swag you will end up with a slightly bulkier roll, but generally, if you're careful it will still be small enough to secure with the swags straps.

G'day Ken,

I haven't heard this is an issue with this bag and from reading some of the reviews it seems to do a great job of keeping our customers warm!

G'day Haymish,  

Yes you can wash the Alaska sleeping bags in an oversize commercial front loader washing machine on a cold wash with mild detergent.

G'day John,

23Zero use SBS zippers which are similar to YKK zippers, albeit without the reputation. I've had a bit of a play with the zippers on this bag and they flow fairly freely and feel like they should be quite durable.

Very similar, I've not delved deeply into the differences and we are yet to receive feedback on them, but the quality of build is much the same.

At a high-level 23Zero claim to use a water-resistant shell and there are some differences in the weights of the fill, but overall I would say they are pretty much on par with each other and it would be hard to recommend one over the other.