Both wheeled backpacks and regular backpacks have advantages and disadvantages. If you anticipate that you'll have trouble carrying your backpack, then opting for wheels may be sensible. That said, some of the smaller and older European cities lack the infrastructure to accommodate wheeled backpacks. One option may be to choose a regular backpack that can attach to a rolling bag handle. Ultimately, only you can decide which option will be the perfect backpack for you.