Britney Spears bought the Ju-Ju-Be Packabe in Perky Perennials style (http://ju-ju-be.com/packabe.html) at Nordstrom at The Grove in LA (there's video of her shopping with her crew on Access Hollywood's site). Later Spears was photographed wearing the bag heading for Orlando. There is video on Access Hollywood's site of Britney trying to get off an airplane she didn't like (they apparently didn’t have real leather seats in first class), and you can see the bag on her back. Also see these links for still shots:

http://x17online.com/celebrities/britney_spears/x17_xclusive_britney_takes_off_for_orlando.php

and

http://www.splashnewsonline.com/wp-content/uploads/2007/05/splashnews_sdfl200507j_01.jpg