Rather like the heat of the middle of summer, travel puts certain extra demands on one's head-covering. Not only are you spending lots of time in one place, but, if you're anything like me, you want to be able to sleep on the bus/plane/train/car without your scarf/etc coming off.
My other pet peeve about traveling is that I want to be able to lean back (see: wanting to sleep) without my bun or other lumps getting in the way. This is rarely a concern during my every day life, but during a bus trip, it's essential. If you have short hair, this probably isn't a worry- but my hair is waist length (and I can't bear to cut it)- so even though it's quite fine in texture, it makes a solid lump at the back of my head.
My solution: I braid my hair tightly (to prevent knots), then tie a triangular scarf. I fold the braid into a vague bow shape- so that some is on the right, and some on the left, vaguely balanced. Then I take the bottom corner of my scarf and, keeping the braid inside, tuck that corner under the knot of my scarf. Basically, I make my own snood. (If I had a real snood, I'm sure that would work- but somehow, I don't. I have some berets, but a. they're wool and it is still summertime, and b. they seem a little too short and tight over the ears to do this successfully.)
I generally leave the scarf ends to dangle- I've tried making them into a small crown, but they tend to fall down at some point. So, in the spirit of simplicity, I just left them down this time.