Queuing up to check-in at the airport is a common place where we can wait for a long time without being able to sit down. Quite often we are also carrying heavy luggage.
At the airport many people will be carrying suitcases with them. They are usually quite cumbersome, especially on crowded public transport. However if they can be converted to become a seat when required then it will give them another function instead of getting in the way.
This can be done by having the wheels further from the front of the suitcase to provide a wider and more stable base to sit on. The wheels will also have to be able to be locked to stop the suitcase moving when the user is sitting on it. The handle can be used as the backrest if it is wider and with more horizontal struts. The main suitcase body will also have to be reinforced to support the weight of a person. This will also give it more strength when in transit and protect its contents better.
As always, if you think you have a solution or if you have a problem you would like me to try to solve then please feel free to comment it.