To free up space on the IPad can a person transfer movies purchased from ITunes to a flash drive?

Can a person transfer saved movies from an Ipad bought from ITunes to free up more space? Flash drives such as the Kingston Bolt talk about transferring pictures and videos but do not address purchased movies. I get mixed answers from techies at Best Buy and Verizon stores. Some of my movies are on the Cloud but I like to have some on my IPad for the grandchildren to view while traveling.