clutch bag 
(North American clutch)
noun
A slim, flat handbag without handles or a strap.If you decide not to wear it, you can always slip the strap into the clutch bag itself....
- It doesn't have a camera and the features won't set the world on fire, but it is easy enough for your granny to use and small enough to slip into a clutch bag.
- Her blonde friend was clad in a midnight blue velvet halter dress of a similar length to Silence's and she had a matching clutch bag.