Avi_dreader said:

. . .

Uh, no. You could pull the dice bag closed with the drawstring and toggle-lock it shut; with all monsters in the bag, it's a pretty snug lockup. But the resulting "beanbag" is still about 2 inches high. That won't fit in the space above the Innsmouth board (being the box with the most overhead space), but it would fit in an inverted Miskatonic Insert (two pockets instead of one).

I don't have that problem. I keep all my Cup monsters in two origami boxes (eight even stacks, four fit perfectly in a box), and all the Spawns, Masks, and "conditionals" (like all the extra BG Dark Young) fit in the smallest plastic pocket in my Kingsport box.

Forgive me if I'm wrong, but are you under the impression that the "walls" of this dice bag are somehow rigid? The reason the bag can sit there as if it were a perfect cube is because of the flat-bottom design. If I wanted to, I could roll the entire bag up into a tiny sleeping bag, or crumple it into a little ball to fit in my pocket, and once I smooth it back out, it would look the same as it ever did. Not to mention I could turn it inside out so that the Webs are on the outside without losing any functionality of the drawstring.

No wires, no cardboard, no bones of any kind. Just fabric and clever design.