I take what most call is a repair kit...just in case something goes wrong while delivering the cake. The repair kit has more than enough icing to repair anything thats on the cake that needs touch up. If you are running out of icing than take more with you ,put it into a large bowl with a lid. I take just about everything that I used to frost the cake in a repair kit. Piping bags full of icing that ive used, tips that I might need, off set spatula extra icing in all the colors that I used on the cake , piping bags....cant think of anything else unless you are putting any decorations on cake after you arrive at the venue make sure to take those.