I like to take my dslr to the parks with me and found that the best way for me to carry this around is in a small padded backpack. This allows me to also stow a jacket, sunscreen, tickets, and my cell phone. I would guess that my backpack is no more than 18 inches tall and is just a normal everyday backpack that you would see kids lugging around campus. Are there any rides that they won't allow me to take the backpack on? I've carried a small dslr camera case before with no problems but the backpack is bigger. It's been waterproofed so water on rides is no problem either. Thanks in advance for the help!