I second that!MONOGRAM POCHETTE COSMETIQUE -
It has the largest opening and the shape is perfect to sit on a counter top while you touch up your makeup
I have the perfect thing for you. Go to your local boutique (they probably won't have it though) or call the 866 #. Tell them you want the accessory pouch that comes with the petit bucket. When I got it about a year ago, it cost $150. I also got the one that comes with the Marais (damier bucket). For some reason, that one was only $140. It is the size (same shape) between the mini pochette and the pochette accessories. It does not come with the chain or any strap (which you don't want anyway), but does have the gold loop thing. It is absolutely the best cosmetic case! I also have the pochette cosmetique which I think looks very nice and holds a lot, however, it is quite wide at the bottom and takes up a lot of the width of your bag. The pouch I'm talking about measures approx. 7 x 4 1/2 x 1 inch. Best bang for your buck!
Is this the pouch you are talking about?
I looked at vuitton.com and eluxury and I couldn't find a picture of the pouch that comes in Monogram.
However, it seems that different Bucket Bags comes with a pouch of different sizes as well.
The vuitton site mentions in the descriptions that the Monogram Petit Bucket comes with a pouch that measures 4"L x 6 1/2"H , the Monogram Regular Bucket comes with a pouch that measures 7.5"L x 4.25"H and the Damier Canvas Marais Bucket comes with a pouch that measures 6 1/2"L x 4"H.