This is a backpack from the Dutch company, Air back. I purchased it through crowdfunding, so it's not available for sale anywhere else! It's super rare. It can be used as a backpack or a carry-on suitcase. When you open it, you can pack your clothes and flatten them by removing the air. The size is suitable for carry-on luggage on airplanes and is designed to fit under the seat. I accidentally ordered two, so I'm selling one. It arrived from the Netherlands today!