The standard by which other energy drinks are judged, Red Bull is the most popular out there. Available in both regular and sugar free versions.

Bawls Energy Drink is an alternative for those who don't like the usual "energy drink" taste. Bawls tastes more like a soda; some say a berry-flavored Sprite-like flavor. Either way, it's got about as much caffeine as a Red Bull and comes in a cool glass bottle (blue for regular, clear for sugar free).