You can carry on this bag to the airplane! Ultra right weight. 2 ways of backpack & trolley bag. The weight is about 2.0kg. There're many ways to use, for travel, out door, shopping, and emergency supplies. "You don't have to worry about the sudden rain because of the water repellent fabric and it hardly get dirty. ◆Particular about usability◆ Adjustment belt have rubber ring in order no to drag shoulder belt and it doesn't easily get dirty. ◆wheels◆ The wheels are strong for friction. It reduce impact . Smooth wheels with no stress. You can put the cover on the wheels when you use this bag inside the room or use it as a backpack, and the room or your clothes won't get dirty." "You can put padlock on the slider of the zipper. *Padlock is not included. The pocket① has small pocket for cards, pen holder, and open pocket. ②There're 2 pockets in front. It has side pocket for pet bottle. When you don't use this pocket, you can close the zipper to make it compact." "The shoulder belt has 1.2cm cushion and drastically reduce burden on your shoulders! It's reinforced so you don't have to worry when you carry heavy goods. It's in S shape to reduce burden on your shoulders and to fit your body. When you don't use this bag as backpack, you can contain the belt. The zipper in the back is for combining with other trolley bag. When you don't combine with other trolley bag, you can close under of the zipper and use as a pocket. *Please note: Don't forget to close under of the zipper when you use it as a pocket. ◆You can contain a lot with small space◇ Hard case need a space for 2 suitcases when you take your things in and out because you have to put it in both lid and body of the bag. But soft case, you don't need many spaces when you open and close because you only need to put your things in the body. There is a pocket suit for PC inside the lid of the bag."