I originally bought this bag to protect my huge 65 L backpack during air travel. It's lightweight and compact enough that I could fold it up and keep it in my pack while hiking, but huge enough that I could throw my backpack into it along with all of my gear, and still have room to spare. It was really difficult to carry around the airport when so heavy, but it was a price I was willing to pay. My boyfriend didn't think this bag was a good idea and bought a bag specifically made for air travel with backpacks, and his had no handles so it was impossible to carry and also ripped, so he won't be using it again. My bag came through the whole trip and both flights in pristine condition, and I now use it all the time to go between home and college when I don't have time or am too lazy to pack nicely. I throw everything and I'm good to go. I've never run out of room with this bag!Now, a year later, we are buying this bag again (in the same pretty turquoise color) because my family had an exchange student this year and she needed another suitcase to bring home all of the clothes and belongings she acquired this year. She had no idea what to do because she needed something roomy and very lightweight so she could take as much as possible home without exceeding the weight limit, and she didn't want to spend $100 on another suitcase. Luckily last weekend I came home from college the day before I had an international flight and I didn't have time to plan what I would pack, so I threw everything I might want to bring in this bag and drove home. I came in the door talking about what a good purchase this bag was and how useful and affordable it is, and now she has a solution to her packing problem as well! This bag is huge, you can literally fit a person in it.If you're in a similar situation, I highly suggest this bag! You won't be disappointed.If you're looking for a bag that offers a lot of organization, is small enough for an overnight stay, or keeps its shape, this is not the bag for you.If you want something so big you'll never fill it up, lightweight, durable, and takes up no room, this is your bag!(Just make sure you get a lock for the zippers or tie them together if you're going to be flying, because they may come undone otherwise)