The outer is printed cotton and the lining is a pre-quilted fabric.
I was surprised at just how much stuff I could fit in it;
I found the pattern via this blog
The sewing took me about 2.5 hours and the pattern was pretty detailed. I felt some of the instructions were superfluous (machine basting, for example) but I just skipped those bits.
There are a few more photos in my gallery. Thanks for looking!