Found a great kvissle bag. It is a cooler, but it is near perfect size. Theres some room on the side to stuff a couple books if you want.
I know some people use the pet bag but it looks like it leaves a bunch of room behind it. Also the cooler should protect it from temperatures.
Major downfall would be the zipper goes along the bottom if you stand it upright (shelf wise).
It looks like the dimensions on the 40 can bag have changed, so the cooler will no longer fit a kvissle. OlarHike's store page lists them as being 15.7x12.6x11.8" while the item page lists them as 13.6x11.8x 12.2".