Neck roll pillows are a luxury when attempting to relax or sleep on an airplane or train but they are bulky and not always worth the hassle of carrying. Recently, I had a genius idea though.
When traveling in cold weather I wear a scarf, hat, and gloves, but once I'm settled into my seat they are no longer needed. At that point I take them off and pull out the travel pillow, so why not merge the two?
Good travel neck pillows have a removable cover for easy washing. My simple solution: take out the inner pillow and replace it with your winter accessories. It may be a little lumpy and not as firm but it still functions and it certainly saves space.