I have a small quilt with a pocket on one end. It folds up into the pocket for storage, but I can also put my feet in it to keep it in place. This would work well on an airplane.

I also have a couple of small fleece blankets with company logos that were gifts from two different employers, so they must be cheap. One came with straps to hold it in a small roll.

If I had to guess, I'd say all three are stuffed into a closet.