Yup. Well, I do specify I will have “sporadic/intermittent” access to email or “no” access to email, because there is a difference. But short and sweet is the way to go.
I recently described myself as being “out of the virtual office.” Away from the virtual office” would probably have been even more precise. I think whatever you say, people will understand what you mean.

Education Details: An out of office message is a compact text that conveys the most important facts: How long you’ll be unreachable, when your contacts can expect an answer, (optionally) the reason for the absence, and, if necessary, a personal note. A referral to another email address, e.g. to one of your colleagues, is often helpful or even necessary.
It usually isn’t enough to just say you’re out and won’t be responding to messages. You’ve got to give people options for how they can get their issue or request resolved. One of the easiest wins here is to provide alternative contact information. That could mean providing your mobile number while you’re out, or, more commonly, providing the phone number and email of the colleague (or department) that will be covering while you’re away.