Not sure what your price range is but look at the carriers at this link
http://www.glamourdog.com/petote-couture.html
The Metro Collection has nice sized bags. I have one for Lacy - the Sienna Metro (not pictured). They just look like big purses - I use Lacy's when I need to sneak her in somewhere and no one ever notices that its a dog carrier. There is only mesh on the top (which you won't see since its under your arm) and a little on the sides. Your two could fit easily into one of these. In fact, they say in the description that you have the option of carrying two dogs
The Bali Collection has two openings (one on each side) I believe - or at least the one I saw did. So they could both stick their heads out.
Here are some more Bali ones that are cheaper and on sale
http://www.glamourdog.com/bali.html
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.