G'day Mi,

It's the lightweight ultrasil compression sack, which is made from a waterproof ripstop nylon, however the compression sace as a product is not waterproof.
The top of it is drawer string, with the "lid" of the sack covering this to create the compression.
The Evac option is a heavier duty material, and has the dry sack roll top closure under the compression "lid".

I'd go the Evac if you have no other weather protection for your hiking kit/rucksack.  It you're using a pack liner and or pack cover, you would need an Evac because you already have additional waterproofing.

G'day Joddy,

Theres a few variables that go into this answer, its impossible to say absolutely as everyones physiologies are different.
The first one is determining the R-value of your sleeping mat.  If you have a mat with an R-Value of 4 or more, the sleeping bag should perform in the ball park of the comfort temp stated.
If your sleeping mat has an R-Value of less than 4, the sleeping bag will not be as warm.
The second one is wether or not you consider yourself to be an average or cold sleeper.  As a general rule of thumb, if you are an average sleeper you should aim for a sleeping bag with a comfort temp of 5ºc lower than the coldest ambient temp you expect to be in...take that to 10ºc lower if you consider yourself a cold sleeper.

As a general guide, if you have a R-Value 4 mat & you are an average sleeper, this bag should keep you happily sleeping cozy between 1ºc to -4ºc, and can be zipped open to use more like a quilt with a footbox for anything warmer than that.

Hope that helps with your decision!

G'day Jodie, no, the Flame and Spark Bags are not zipper compatible or designed to be connected to one another. If you're looking for some options you can zip together as a double, then check out the Altitude and Ascent, or the Journey and Trek models.

G'day Nicola,

Sea to Summit recommend an XS or 6L compression sack for the Flame 3.
You can find them here.

G'day Xavier,

Its really hard to say for sure, but I'm always of the opinion that if in doubt, go larger.
The length isn't going to affect the performance of the bag, but being too small around the body, and creating a lot of pressure spots in the bag will, especially in a mummy cut like this.
Check out the video at around 4:45min mark.
My hips are 128cm and whilst I have room around my body needed to go up in length, I'm also not a fan of mummy bags at all, so need more room.
The visual demo might give you an idea of how the bag fits, and I think the long version would be a more comfortable option for you.

G'day Mel,

You're right on the cusp of being a tad too tall for the regular size, which has a max user height of 170cm. Lauren in our video is 171cm tall, and while she can fit in the bag, she did indicate she'd prefer the long version, as it gives a little more space to move.

G'day Mel,

The zipper on the Flame Fm3 is a 3/4 length zip.