Reddit mentions of Bankers Box Handifile Expanding Organiser - Black

A binder with card pocket pages makes item storage and selection sooo much easier! We keep the Random Items in two separate pages, whenever the time to choose one comes, we just smack them down on the table face-down and select one. Alternatively, you can use a random number generator off the internet.

I got mine from a friend who ordered them from Amazon, so I can't be sure what brand he got, but it's something like these pocket pages here.

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Edit: It should be stated, however, that the item binder does not fit in the original GH box. We're using a organizer to keep things tidy within the box, but then we keep our items separated in their own special binder, and we keep map tiles alphabetically ordered in an accordion folder, together with the party sheets, unlockable envelopes, removable stickers, etc. All of these goodies fit snugly into a large, blue IKEA bag, handy for those Grab'n Go situations.