G'day Jesse,

This sleeping bag has a comfort rating of -5 to -10 degrees, which means it is suited to winter or cold weather camping.
You do have the option to open it out fully like a blanket if required, but it will still be pretty warm.

G'day Tammy,

Yes, they would. These bags open up flat and zip together like a sandwich, so the left-hand person will have to deal with the hood.

G'day Tammy,

Yes, the pillow is a separate item.  You can compare the first three images - the first two have no pillow, the third one does.  
Hope that helps!

G'day Rodulf,

The Alaska 900 and 1100 just come with the one pillow, the Alaska 1400 comes with two pillows.

G'day Tony,

We've got a handy compare function on our site if you're using a desktop web browser so that might help if you need to compare two items next time. The Alaska is slightly narrower than the Rivergum and has dual side zippers. The Rivergum has either a left or right zipper, and a zip-out fleece liner. Overall they're fairly similar aside from this, and are good quality bags.

G'day Opal,

I've just called 23Zero to double-check, and they confirmed that yes you can zip two of the Alaska Black 900 Sleeping Bags together to make an extra-wide double.