If you are not traveling far with your poster, it is sufficient to roll it up and secure it with two rubber bands at either end and one rubber band in the middle. In case of rain, it is a good idea to place it in a long plastic bag. If you are traveling long-distance to your poster presentation, it is advisable to buy a poster tube, such as the one in the image below.
These tubes can be purchased at the UT Art Co-op or an office supply store. If at all possible, never check your poster with your luggage. Carry it on the plane with you. (You may consider carrying on the clothes you plan to wear when presenting, too.)
There are many different ways to hang posters. Some poster holders use clips to hold the poster in place, while others use Velcro strips. In most cases, you will not need to bring anything to hang your poster. Those materials will be provided by the event organizers. If you have questions about the poster set up, contact the event organizers in advance.