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The best method for keeping hadassim & aravot fresh for all of Sukkot is disputed. As I don't have enough fridge room and find damp paper toweling and foil primitive at best I have moved into the 21st century. 4 mil Mylar, Tyvek 10G, and 70gsm Rayon. Four days; still damp; vegetation is great shape.

What does everything do? The Tyvek touches the greenery. It prevents water from coming through (it is highly water resistant, but if I sprayed a hose on it it would fail). Water on the delicate leaves can cause black spots; way too much can cause sliminess. Tyvek does let water vapor through, though

The water vapor comes from the Rayon. Wetted under a sink and squeezed until damp. The Mylar provides a seal. The Rayon makes the water vapor; it passes through the Tyvek to the aravot and hadassim (we really need a single word for "the not lulav parts of the lulav), the Mylar keeps the vapor inside