Right now I'm using a horizontal Freudian Slip in a Timbukt2 messenger bag and also hope to use it in my (on-order) Western Flyer when I'm not carrying a computer bag. There are times I have my computer bag with me but just want to carry the Freudian slip and some organizer pouches, and when I have the WF I'll want to leave the WF in the hotel, but take the Freudian slip with me.
Currently I'm using a tote bag that was swag from a conference. The Freudian slip fits in nicely and the tote bag can be folded very flat and stowed in luggage. But the tote is a single compartment and there are no O-rings to help organize things (amazing how quickly I've come to appreciate the beauty of that system!). I've looked at the shopping bag and the utility tote and it seems that a Freudian Slip is longer than the height of the bags.
So does anyone have any suggestions for a currently available solution? Or could Tom be persuaded to think about a tote-like bag that could be folded up for packing, accommodate a Freudian slip, have organizer help, and look "business-like"?