Don’t unpack your stuff, in the first place. Do not move in to this space that is not yours. Play it close to your chest. Keep it close to your suitcase. Forget hanging things up, putting them in drawers. If you can’t see it, you will forget it.
Then start the night before you leave. Everything you touch, that you know you won’t touch again before you go, pack it.
Continue through to morning. Pack everything you touch. Your cell phone charger, your pills, the pillow you have to carry because there isn’t another one like it; your nightclothes, your toothbrush.
Move in a circle around the space. Scan the entire perimeter, every surface. What are you at risk of forgetting? What, in this landscape that belongs to someone else, belongs to you? The fixtures aren’t yours. You don’t travel with furniture, with animals. Check under the covers and under the bed for whatever may have fallen there.
Repeat until every surface has no memory left of you. Leave the space as you found it. Check-out is at noon. Move on.