Not having owned a Fleshlight before, I was surprised to find out how bulky the device actually is. Weighing in at just over a pound, Fleshlights are about 10" long and almost 4 inches in diameter. If you live in a dorm, you might have trouble hiding this massive monolithic masturbator from your roommate. Morally speaking, I would never use another person's toys, but your mileage may vary. I know college aged guys have an itch to stick it anywhere it'll fit. At any rate, this thing is pretty freakin' big. If you plan on flying, leave it behind. I'm sure you can use the extra space for more practical things.
Although the entrance orifice is extremely small, the material of the Fleshlight is incredibly forgiving and can stretch to accommodate a guy of almost any girth. As I said, the insertable length is about ten inches, so unless you're Lexington Steele you shouldn't have any problems.
Ergonomically, the hard plastic shell has raised ridges to allow the user a firm grip when moving the masturbator up and down.
P.S. — This is going to sound incredibly awkward, but do you have any suggestions on what I could get him?