HiDREAM Expandable Pet Carrier BackpackExpandable Compartments: This backpack features expandable sides that allow you to increase the interior space as needed. The expansion feature provides extra room for your pet to stretch out, making it ideal for longer trips or for pets who prefer a bit more space. Multi Functional Use: The versatile design allows you to use it as a traditional backpack or expand it for additional space. This flexibility ensures that the backpack adapts to your pets