Joseph, I have used a combination of 2 things. 1 - used masking tape to create a 15-20mm border all the war around, that when peeled off at the end of painting, enables a clean handling area. 2. Put it diagonally in a box made to fit and protect the painting. I just got 2 boxes in which I had purchased stuff that were 4-6 inches deep and the length and breadth of the canvas, cut out the narrow sides I didn't want, and then taped then together together so that the painting would fit snugly when slid in diagonally. I kept and used some of the polystyrene packing frame to ensure a good tight fit. Cost - zip. Alternatively, you could use an old hard cardboard suitcase and build a lightweight wooden frame inside. Again alternatively again, ensure the border tape is wider than the timber frame and fit a similar sized framed canvas over the fresh painting so that the frame of the top canvas protects the painted area surface; and then tape the 2 together. You could tape a 3rd canvas under to protect the back of the freshly painted canvas to make it feel a bit safer for travel. Hope that helps.