My think tank mirrorless mover 20 is small and carries my xt1 with lens, x100s and 1 lens (or 2 lenses). Lenspen, spare batteries, sd cards, ef-20, iPad 4, rain cover, with room for more accessories. Their available in heathered grey now, which I like more then my original one.
I also have a Hadley small. Which carries about the same but is a little bulkier and also misses a handle on the lid.