I’m going to be flying to Orlando next summer for SeaWorld Camp but my parents have limited me to only a carry-on bag. The problem with this is that I can fit all of my necessities into the carry-on bag, however it has no more room left for my aquarium bag (a medium sized hiking backpack filled with toys and stuffed animals for the underwater viewing areas at SeaWorld) or anything I plan on buying souvenir wise once I get to SeaWorld. I do, however, have a large backpack/purse that I could possibly bring. I’m just worried that it may be too big and I don’t want to bring it just to find out that it’s too big to bring. The size is 15x6x15 (length x width x height) Thanks for any help!