The shuttlecock humidifier is an inexpensive way to keep shuttlecocks at optimal humidity. ($5!) Research: Wilson Patent: https://patents.google.com/patent/US7591369 - ~50% Relative Humiditiy (RH) More Wilson Patents: https://encrypted.google.com/patents/US7591369 Ashville Badminton Club: https://ashevillebadmintonclub.org/wp-content/uploads/Proper-Shuttlecock-Moisture-Levels.pdf ~60-70% RH How