When you are traveling you can put your paintings in drying boxes to protect them until you get them back to your studio. Drying boxes come in all shapes and sizes, from heavy wooden ones that carry large size paintings, to small corrugated plastic ones that you can take outdoors for painting plein air. There are also some simple painting support carriers that are made like a frame and carry one painting support on each side. Here are the suppliers:
Open Box M
1392 Southfork Road
Cody, Wyoming 82414
Phone: 800-473-8098
Web: http://www.openboxm.com/
RayMar
1721 Rose Garden Lane, Suite 6
Phoenix, AZ 85027
Phone: 888.809.3314
Web: http://www.raymarart.com
Artwork Essentials
5622 Highgate Terrace
Irvine, CA 92603
Phone: 949 8562196
Web: http://www.artworkessentials.com
The Outside Shore
P.O. Box 147151,
Edgewater, CO 80214-7151
Web: http://www.outsideshore.com/school/art/easel/wet.htm