This is an invader progression board and insert for Spirit Island, designed to fit, along with the adversary cards, inside a Simply Tidy 4x6 photo box from Michael's. This was not designed to be a part of a larger "fit everything in the original Spirit Island box" solution. I keep my game organized in a crate.

There are 2 parts, the main progression board and a drawer. I keep the adversary reminders in there.

The board can store the invader deck and supports doubling up on invader actions. There is also a place for the adversary reminders under the cards.

I think a future improvement would include either increasing the size of the drawer space (there's some space in between the top of the drawer and the bottom of the card section) or adding another layer above the adversary reminder slide so that you can have two stacked on top of each other. There's also an extra space on the right side of this that is just there to fill up the rest of the space in the box. I don't know what it could be useful for but maybe someone else can figure that out.