I leave the resin in the tank, and just leave the wiper in the tank in the same spot it sits when installed in the printer. The cover has a cavity that holds it in place there.
If I’ve emptied the tank and don’t want to contaminate it, I let the wiper drain (e.g. with a stand like this or a paperclip solution) then put it in a medium-sized ziplock and place it in the box adjacent to the tank.