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.