You may have number of Tarot Card Decks with you and all of them can be kept in their Original cardboard boxes , but the ones you use regularly needs special care as they become your personal sacred decks. You should keep these cards in a silk or cotton bag and then in a box. I personally prefer a wooden box. The reason is that silk and wooden box combined together becomes an insulator against strong ambient energies. These cards can be wrapped also in a silk or cotton cloth and then keep inside a box. During readings also keep the cards wrapped in a silk cloth or in a silk bag to keep them clear of the ambient energies.
Neera Sareen
International Master in Predictive Science,
Tarot Master & Spiritual Transformation Coach.