I've been looking for The Bag to hold my acrylics when I am on the go. I found the last one at my local Container Store the other day. It's a Reisenthel Black Toiletry Kit. I found it in the travel section.
I was going to buy this (they also had some with handles but I can't find a link) but decided against it as it is somewhat flimsy and probably won't take the abuse that I tend to give my bags.
As you can see from the above photo, it fits A LOT of paints. I have 11 bottles of Blick Matte acrylics and 22 tubes of Holbein acrylics in the above bag. So far, I am very happy with it.
My Posts on my favorite supplies
How do you store your acrylics for on the go use?