Backpacking is where you hike or travel around with all of your
posessions in a backpack on your back.
There are several different types of backpacking. My favorite
being budget backpacking.
It's a wonderful way to experience different cultures and
areas.
Another use of backpacking is on online Video Games. It's when
you're getting all the kills or points for your team hence
"carrying" them across the finish line so-to-speak.