The phrase "to have a carrier" means to have a profession or job that you are skilled in and that provides you with a way to earn a living. It refers to having a career or vocation. Full definition
If you do not have a carrier for your cat, you can purchase a cardboard carrier for $ 5. (aspca.org)
Travel will be made easier having a carrier for small, confined spaces; a stroller for shopping and walks in parks; and a car seat for riding to and from destinations. (easybabytote.com)