In my experience, Sea World is way more thorough in checking bags than DL is. I've slipped a bottle or two in my pockets at Sea World, but I wouldn't think of just bringing food or drinks in my backpack. Too bad Sea World is a Pepsi park (can't stand the stuff and I don't like Aquafina water either--gross), so in order to drink anything all day, I have to bring something in. Suffice it to say for that reason alone, I don't like spending time there.