I’m light as a feather, but the strongest person can’t hold me for long. What am I?

What can travel around the world while staying in a corner?

Is it more than you bargained for yet? I've been dying to feed you anything you wanna eat. 'Cause that's the food I am this week. Lie in your apps, next to the macro trackers. I'm just a snack on your cheat day, but you're just a diet gone wrong. Drop a carb. And break a fast. We're always sweetening it, and sweetening For the munchies.

You can see me in Miami, you can see me at a show. You can see me breathe through one hole and use the same one to blow.

Notice me and see how I sit atop all the chaps, Guarding pates from sun's hot slap. With a brim so wide, or non-existent and narrow, I crown thee a stylish shield, so no need to bellow!