Ristretto for 13″ MacBook Air or MacBook Pro fits:

TOM BIHN Ristretto for 13" MacBook Air or MacBook Pro vertical messenger bag fits....
Plus a water bottle.

Ristretto for 11″ MacBook Air fits:

TOM BIHN Ristretto for iPad or iPad 2 vertical messenger bag fits....

Ristretto for iPad or iPad 2 fits:

TOM BIHN Ristretto for 11