This is a carry variation I'll use with the majority of my clients at one point or another throughout their programming. It's useful for novice to advanced trainees, and can be programmed into you workouts in a variety of ways.
Including loaded carries like Farmer's Walks into anyone's program can pay huge dividends, but one of the reason's I like the Suitcase Carry so much, is the amount of recruitment required from your abs to perform this exercise. When done correctly, your abs so certainly feel like they are working just as hard as the rest of your body or more so.
Check out the brief video below to see how to perform it correctly: