November's Dawn
I have lavender in small pillow/pouch and cards in another pouch, and everything in one very big bag. Lavender pouch only touches pouches and not cards directly.
I keep a citrine crystal in my bag with my cards. It is one of two crystals that don't need cleansing. Most crystals need sunlight or moonlight or a saltwater bath to cleanse them every once in a while but not citrine. It helps absorb any negative energy or simply any residual energy from your last reading.