I have no specific experience with any bluetooth adapters, but there are a variety to pick from. I suggest finding one of them that's got a very short profile extension from the USB port so it won't be prone to getting snapped off and maybe can be left in place when stowed in the bag. (if laptop, you did not say)
Read user reviews and pay attention to anything sleep related, such as failure to go to sleep, failure to wake, and failure to re-pair after wake or restart. Those are your most likely issues.
