for regular in the car sleeping, should I buy medium or large?
LISA S I think a medium would be fine for in the car.
HENRY J I have used mine in the car many times. It really, like all pillows, depends on how big you are. I am 6' 3" 255lbs so a large is prefect for me even in the car. If you want it for your neck while your driving maybe a smaller pillow will do. These pillows are phenomenal nonetheless. I Hope this helped.
DANIEL J L If in car is all you are going to use it for, I'd go with the Large. They do comperss, so the large would give a little more comfort.
JOSIE T I ordered the medium size for camping and find it to be a sufficient size. I think a medium would probably be fine for the car. In the end, it's also probably more an issue of personal preference and sleeping habits.
RICK L It depends on who is going to use it, I have the medium and if I was to buy again I would go with the large. The medium works good, but a friend has the large and likes the support it gives over the medium. They compress nicely so they don't take up much room, we use ours for backpacking.
SHANNON H Large it loverly and not too big
TOSHIE L We have three small pillows for camping. Both adults and a child can use perfectly in mummy style sleeping bag. I have seen all three sizes. If adults use for regular car sleeping, I would recommend medium or large.