You'd probably both squeeze under it if the quilt was laid flat, Leia, but it won't be overly efficient and you certainly wouldn't be able to comfortably wrap it all the way around both of you. It's designed as a one-person sleep system.

G'day Tammy,

I went down to try this out for you, but due to circumstances in our shop over the last week, I don't have access to a Megamat at all sorry. Having said that when I looked at the quilt I'm pretty confident in saying this won't work really well. The strap nearest the foot of the bag is pretty short. The whole bag tapers in quite a bit towards the bottom and I suspect it's really only designed to be used with lightweight hiking mats with a matching taper. Even if you extend the straps I think the bottom of the bag will be much narrower than the mat. If you'd like me to actually give this a try I'm happy to follow it up next week when hopefully, the shop here in Adelaide is back in full swing. Just let me know. 

G'day Sue and Tammy,

I've just tried this and it unfortunately it doesn't work. You could use it as just a standard quilt on the mat but unclipping the securing straps, but you won't be able to use the straps to attach the quilt to the mat.

G'day Kevin,

You'll have no worries using a Thermolite Reactor with the Sea to Summit Ember EB2 Quilt. Being a quilt there's plenty of roof under the Ember and you'll be able to use the Reactor much like a sleeping bag, then have the quilt over the top. 

G'day Roger,

The Sea to Summit Ember EB2 Quilt can only be clinched in the bottom half. If you wanted to clinch the top half, you'd need to MacGyver it a little bit. As for the pack down size, they pack down to 27 x 13 x 13 cm.