I've had these window blackout magnetic curtains for the car for a while from Amazon.https://www.amazon.com/dp/B085XF6BV1/ref=cm_sw_r_cp_apa_glt_i_25MH4CC4KM2VS0NST1Q4?_encoding=UTF8&psc=1 While they don't completely block light they do provide privacy and can't see inside with them on. Also since the magnets stick around the frame of the door you can slide them back when not in use.