For a while I've been very, very happy carrying a Kipling Alvar XS.  Just big enough for my daily needs, classier-looking (in a sturdier fabric, and solid) than the LeSportsac bags, and had nice organization.  It's the same style as this one, a flat crossbody with a zippered main compartment and two front zipper compartments.  However, with the addition of an Epi-Pen it became much too full and I sought alternatives.

First I went for the Kipling Alvar (full size), which is, unfortunately, just TOO big for my needs.  It has two full-sized pockets in addition to the two front pockets.  Still very sturdy-looking and I like the nylons they use, but my stuff was just flopping around in there.  When I tried to put my Nook into it (because it's definitely big enough), the fabric pulled all out of proportion.

I'm leaving for vacation tomorrow so I was kind of desperate.  I hastily ordered both the LeSportsac Kasey and the LeSportsac Shellie for overnight delivery, mainly because the Z is the only store offering overnight on Kipling bags, and they didn't have anything that looked like it would be the right size.

The two bags just arrived and I examined them both to see which would suit me better.  Well, the Kasey's interior main compartment has no organization at all; it's just a big zippered pouch.  (Both the Kiplings, by contrast, have zip pockets, slots for lipstick or pens, whatever.)  That lack was a dealbreaker for me; if it had had a zip pocket and maybe just one slot for lipstick I would have kept it.  I'm keeping the Shellie and heading to that product page to write a review now.