I e-mailed the passporter people to ask what is considered a large backpack. As some of the Rome excursions do not allow them. Apparentely, the large backpacks are in reference to those traveling by backpack through Europe. I guess, they don't want those backpacks that have all of their luggage in it. I thought my backpack is pretty big but I'm traveling with 2 kids and I carry all their stuff. I tried looking into messenger bags but they are too small for a camera. I'm thinking for Rome... I'll need to pack a game boy & one book or workbook for each child, video camera, Digital SLR camera, extra lens, battery, memory cards, maybe a monopod, water & snacks. Dh could probably carry some of the stuff in his day pack but it is a lot of stuff. What are others doing that are traveling with kids. I'm thinking of just using my trusty backpack and just be extra careful when we get in pickpocket situations. I could always take it off my back and carry it with my hands at that point. What do you think?