We just got back last Monday from our first trip. My plan had been to have a backpack and camera bag for my DSLR camera, and bring both of those with us everytime we left the stroller. The backpack had diapers, changes of clothes, autograph books, snacks. Well, by day 2 we found it a pain to take that with us, and we had also added a tote bag with light-up toys, stroller rain covers, extra sandals. (We traveled kind of heavy!). We took our chances and began leaving everything but the camera bag, and never had any problems. We did buy one of those overpriced $17 misting fans, and we took that with us. We left our refillable mugs with no problems, but we did take any kind of souvenirs or anything in a Disney sales bag, so as not to tempt anyone. It seemed like most of this kind of stuff was left in most people's strollers, and we never heard of any problems. HTH!