It depends on if you're going to the park to trade or to ride rides. If you're going to trade only (and of course, this applies to pin trading events), binders with the 9 pocket pages work the best because some traders prefer their LE pins to be on the original cards they came on. If you don't have the original cards - either you no longer have them or you traded for them without cards - then the bigger pin bag is the easier/lighter way to go because you can fit more pins per page than 9 pins in those pocket pages. If they are hidden mickey pins, cheaper OE pins, and just "trader" pins in general, some people like to use corkboards; but those are bigger and thus, harder to transport. If your primary goal is trading, you may need a stroller (yes, some people use them without children inside), or luggage / file-case-boxes with wheels. Because you cannot bring luggage into the park (they have said you cannot "drag/pull" anything behind you with wheels, you can only "push" things with wheels - hence the reason some people use strollers or wheelchairs), you can only use luggage / file-boxes with wheels at pin events at hotels.