I rolled up the queen memory foam topper from Costco tightly and it was about 20" diameter. Secured with four bungee cords for now but will make up velcro or web straps for tighter wrap. It fit under the jack knife sofa after a bit of work and also came back out with a bit more fighting. My sofa only opens up about 20" and the front access behind the removable board is only about 16" high. But, next weeks trip to the R-Vision rally in Elkhart IN should have more comfortable sleeping than the trips to NY and SC.