This is the most versatile backpack I own. I use it for 1-3 night light backpacking trips, week long personal travel, lugging workout clothes to work, and day hikes. It is small enough to be a carry-on item on airplanes, and has straps on the side and bottom where I can attach my sleeping pad, yoga mat, or whatever else I want to bring along with me. The bottom zip compartment is great to store shoes, and other things you might want to keep separate from the rest of your stuff. It is also SUPER comfortable for short and long periods of time. I own large 60+ liter packs and smaller day packs, but this is by far the pack I use the most - the size is perfect for so many occasions.