I’m planning a 3-week trip to Europe. I’m trying to decide whether to get a regular backpack or a wheeled backpack (something with wheels that also has backpack shoulder straps and hip belts). Either one would be carry-on size, about 22×14×9. I’m looking at Eagle Creek or something similar. Anyone use wheeled backpacks before? Are they worth it? Or is it a matter of doing neither function well? (I’m someone who prefers wheeling her bags, by the way) Thanks.