BackdropAlley 5x10s?
Had one a while back. Cheap, decent size, a few minutes in a dryer took the wrinkles out. Add a PVC frame for $10 and some clamps, all from a home improvement store.
Solid colors, though. Anything for full lengths will have wrinkles short of paper or linoleum. Again, solid colors and not portable.
I'm afraid full length portable backgrounds without wrinkles doesn't exist. I never understood the wrinkle aversion to begin with. Too bad Photek lost their manufacturer. The 8x12s are great and store in a bag. Tons of wrinkles but still looked "smooth" with a shallow DOF. Even the 6x7s gave enough room to move away to let DOF take care of the wrinkles.
Short of non portable paper, you have to live with wrinkles on location. Now a King size air mattress and sheets stretched over it are a different story. Small bag for portability, a few minutes in a dryer, cheap...............
40D, 24-105L, 380EX Speedlight.
Olympus E3, 14-54, 50-200, EC14 and Metz 48 AF-1.