Leslie, this is for you--here are the different sizes that I've made or adjusted. The pink camoflauge bag is the size that we all normally make--I think--for library bags, etc. I am pretty sure that the pattern that Em uses has a larger version in it and that is what I used for the black bag. This way you can see the difference in sizes a little better. The little bag is a nice tote for little girls. The other pattern I've used is Simplicity 8852, which appears to be discontinued now.
Small 11" H x 9" W x 3" D
Medium 14" H x 12" W x 5" D
Large 15" H x 16" W x 6" D
My "Picnic Bag" I made a couple years ago. This is also the same size that I've used for my swimming bag. It is the large size and will hold a lot of stuff for you.
Inside lining fabric
Detailing on the straps--single fold bias tape topstitched on the nylon webbing before the straps are attached to the bag. This also shows how I secure the top of the straps at the upper edge of the bag. I haven't had a strap detach yet.